thinktubes 

Do you fellas with bigger boats find yourselves pushing the saddle far back on the rails?

I wear a size 12.5 and almost always end up with the seat back to the limit. Of course this varies depending on the seattube angle of the bike, but even on bike with 72 degrees I'm pretty far back.

I definitely have never found KOP to be useful, comfortable, or efficient for my riding style.

oldbobcat

Any correlation between KOPS and your actual position is probably coincidental. For road riding, ideal saddle setback is where you can sit all day and put little or no pressure on your hands, and still pull yourself out of the saddle without too much effort. Generally, the lower your torso, the farther back the saddle must go.

Foot size may affect saddle setback. So can cleat position. If you feel your foot size is compelling you toward too much setback, try moving your cleats rearward to position the pedal spindle further behind the ball of your foot. It might change your position, or it might not. If anything, it could improve your pedaling power.