Handlebar and saddle geometry?
 

As I am getting fitter, I am able to ride with a further drop in the handlebars (about 3 cm) than I used to. As I did this adjustment, I have also (just by b*tt feel) moved my saddle back about 1 cm and adjusted the height lower by 0.5cm.
This feels pretty comfortable to me, but I have no idea if I am doing something wrong.

What is the accepted relationship of handlebar drop to saddle back position and height?

Thanks

If it is working good, you can ride for a long distance while relaxing, then it is correct. Funny thing, no two people will fit the same bike.

The more you bend over the further back your butt needs to be for balance (whether you're on a bike or not). As your butt moves back the distance to the bottom bracket (I.e. center of pedaling motion) increases slightly. It sounds to me like what your feeling matches theory pretty well.

Thre relationship between the saddle height to saddle setback is about 3mm higher for each 10mm that the saddle is moved back. That means that the saddle would need to be lowered by 3mm to maintain the same saddle to pedal distance.

That sounds opposite of what Peter White says on his website. If I move the saddle higher and back, the leg reach to the bottom of pedal stroke would be getting longer. Not sure that would be comfortable for me.

This seems right to me and is more intuitive (the farther back you go, the more your legs are stretching). I just moved my saddle forward and it feels like I need to raise it a bit.

That's not what I was saying to do. Since moving the saddle back makes the saddle to pedal distance longer, you have to lower the saddle by 3mm for each 10mm that the saddle is moved back, to maintain the SAME saddle height.

Solution: assuming saddle height is correct at start, measure saddle height from center top of saddle to lowest/farthest point to pedal spindle. (This point should make your crank arm look like it's extending the seat tube, for obvious reasons.)

After moving saddle back, lower it as necessary to get the same saddle height. Some people won't notice 3mm. And of course some have their saddles at the wrong height to begin with. :D

Got it. That's about what I did.