Thanks for all the info everyone! As was said, much depends on the skill of the individual fitter. I guess this starts with Steve Hogg and works down from there. I use a guy here in NJ that does a LOT of fittings (He's supposed to sell more shoe wedges than anyone else in the NE.), and it's all eyeball. If I could find someone with his level of experience, and using a computer graphic like Retul, I'd probably make the investment.

Although he set me up on both my Parlee and my Scott Addict, I have waaaay more power in the drops on the Addict. Both have Fizik Arione saddles and pretty much the same measurements. If I get a TT bike, I'd really like to get the level of efficiency I have on my Addict.

If anyone had recommendations for fitters in the Philly-NJ-NY area, I'd appreciate them.

No, I sit roundly on the saddle.

I have ridden rollers a couple of times and did not notice anything. Go figure.

Been thinking about this! Saddle comfort has always been a problem for me. I have a bum right knee, which causes a somewhat out of line pedal stroke on the right. When I experience chafing, it's always on the right hand side. If I look at the front wheel when riding, I am looking at the left sidewall as opposed to looking straight on at the tread. I'm wondering if all of these things are possible indications of not seating squarely and evenly on the saddle.
Is this something that the Retul could possibly help me correct?

Hmm. I might need to try this. I can never get comfortable on a saddle, largely because my pelvis is crooked due to the scoliosis and my severely knocked knees. (A friend once described me as a horse who should have been shot long ago.) Following some online comments by Steve Hogg, my saddle nose is pointed right slightly to compensate for my left-looking pelvis. Still, I need to dismount far more frequently than I should, or I want to.

Try one of these, it may help.https://www.bikefit.com/forefoot.htm

Yes, Retul could be used to improve your knee alignment and position. But as others have pointed out, you need a good fitter to work with you that will understand your problem. As far as figuring out if you are square on the saddle, have one of your riding buddies watch you and see if the seam of your bike shorts lines up with the center line of the bike seat.