I think the problem is that I have long legs(I wear, like, a size 32wasit/35length jeans) in comparison to a relatively normal torso(medium shirts generally cover what they need to) and relatively longer arms(generally need a large/X-large long sleeve shirt for the sleeves to actually cover up to my wrist).
and yes, it is very possible that this isn't my true riding position as I've been out of commission for a couple months(finals, projects, and family issues), so I'm going to try getting some better pictures up this evening.

ALSO: my front wheel was on a book to raise the front up with the elevated rear.

Remind us again why you want to correct your fit? Are you uncomfortable?

yes, I often have pain in my knees and from my lower back up through my shoulders.

I know nothing.... however, flatten your back and quit hunching over. This will also push your torso forward and down a bit then you can relax your arms. Then new pictures and we will all repeat opinions.

Edit after rereading OP: You were fit to your previous bike? The shop that did the fit should have those dimensions. Just apply them to your new bike.

Your back looks messed up, your saddle is WAYYY far forward. Maybe lower saddle and push it back some.

Have someone take good measurements of your body and try the competitive cyclist fit calculator.

Something looks horribly horribly wrong.

I'll be watching for updated pictures of your actual riding posture, but other than the fact that the seat seems a bit high and angled forward, I don't see anything obvious about this fit that couldn't be fixed simply by flattening your back and relaxing your arms. Your arm, shoulder, wrist, neck pain could could all be caused by a nose-down seat angle. Bad news.

I think I'd look equally as awkward if I put myself in that posture on my bike, and my fit is great.

There is a fair bit of seat--> bar drop, but you can always flip your stem up instead of having it flat. Comfort > Looks.

Just realize that the discomfort is simply an indication that something is wrong, not necessarily an indication that something is wrong with the bike's setup, it could be the bad habits regarding posture, balance, relaxation etc..

Good luck, and I'll peek back in when you get new pictures up.

-Jeremy

Tough to tell from the photos, but your saddle looks too far forward to me. I'd start with pushing the saddle back and lowering it. Next, I'd consider flipping the stem up.

Really need better photos without your head ducked like that which makes everything look weird. Also, have you tried rolling your hips forward instead of sitting so flat on the saddle? That would relieve some of your back pain, but you may have to adjust the angle of your saddle for crotch comfort.

This thread has the making of an epic. Something for everybody...

updated pictures, huzzah.
if you need more, just keep asking and I will test the patience of my photographer/sister. XD

bike is too small...you have a ton of seat post showing and you could probably stand to go up a tiny bit more for a little more leg extension. Otherwise the reach looks fine. You probably could get away with a 59 or 60cm and have less seatpost showing. And a less aggressive saddle to bar drop. However...if you are comfortable then you can make this bike work.

I am the same size as you and ride a 60cm.
Your bike seems small.

your stem looks short too...

Those pics look much, much better. How about one more photo with the cranks level and your knee-forward side nearest the camera--I'd like to see a better photo of your KOPS position.

move seat back to the center of the rails. You are to far forward. Do that and take some more pics. If needed you may need to swap out the stem. Looks like 100mm on there now. Maybe a 110mm or 120mm. The bike is not to small. You can get it to work for you.

Dscott makes a good point that we seem to miss a lot on these threads. The primary driver of changes to your setup should be comfort and efficiency\power and not neccessarily how you look to us via pics. Back pains can be attributed to too much reach and or too much drop and sometimes neck and shoulders to bars that are too narrow. If your back pain is due to too much drop then you will need to lessen it. Some people can ride 100 miles with 10 cm + cm of drop and others max out at under 5cm. If you want to obtain optimal fit then you need to figure out your optimal reach and max bar drop. Maybe if you just ride more you can get comfortable with this pretty aggressive setup, or maybe not. That bar drop is pretty much a function of head tube length and seat height that's why long legged riders need to pay close attention to head tube length when picking frames.

I would agree on the seat father back suggestions, perhaps even lower it a tad also when you move it back, though a pedal forward and level photo would be needed to see for sure. Also try flipping your stem up for awhile. That bike will probably fit you with adjustments.

https://www.bikeforums.net/road-cycling/541255-who-bf-runs-largest-saddle-bar-drop.html

Seat is too far forward perhaps you need a longer stem as well.With the changes the bike should maybe be ok.Why did you put the seat so far forward seems strange.

so moving the seat to a more centered position will be my first alteration.
I believe the stem is a 100cm, but I've got a 120cm Cannondale stock stem I can switch with.
I also believe my saddle and handlebars are slightly pointed downward and thus not flat/level; should I change that?

Why?

Are you too forward relative to the spindles? weight to far forward?

Anti, if you just spend a few hours on this site searching on "fit" I'm pretty confident you can figure out the basics of proper fit. There is some pretty decent info here as well as other sources online. You make changes for a reason. IE my fore\aft balance on the bike is not right so I'm going to play with the fore\aft on my saddle (+ - stem) or I feel like my seat is too high\low so I'm going to lower\raise it or I feel too long\short so I'm going to try a shorter\longer stem or I have too much bar drop so I'm going to try adding some spacers and going with a stem with more rise.

Instead of making changes based on us looking at your pics make changes as based on your own assessment of comfort/efficiency/power after each of your rides. Finding your optimal setup will take time and miles.

You're going to extend the time it takes for you to discover your ideal fit if you make changes to your setup that are not done for a logical reason. I'm still kind of wondering about all that bar drop but what seems like a lot to me may feel perfect to you.

If you have access to two tools you should be able to get a friend to help you with a really basic fit. You need a level and a plumb bob. Put your ride on the trainer and clip in. Pedal for a minute or so to get warmed up. When you are warm spin so that you stop with your right leg in the 3 o'clock (or horizontal) position. Have the friend check this with the level on the crank arm. Then hang the plum bob from just below the kneecap where your knee protrudes the most. With any luck this will gave you basic knee over spindle or KnOS. Making sure that your cleats are in the correct spot, check that the plumb bob sits roughly over or just behind the spindle in this position. Adjust saddle fore/aft accordingly. Then take the right leg and get it to its lowest point. (usually in line with the seat tube of the bike) and make sure you are not over or under extended. That should get you close.