if you move your seat forward you will bring your legs up higher to fill the thigh brace, knee pocket.
if you move your seat back it will lower your knee hight on the thigh brace.
if your seat is all the way forward it is hard to tuck forward
if you move your seat back it is easy to tuck forward.
this will affect your mass distribution.
try it, you will see what i mean.
for me, at least with my seat all the way back I can tuck way further forward. putting my mass over the center or front center of the boat.
It will depend on your size and strength
tiny people put their seat way forward and drive the boat from the front
big tall people put the seat back and drive from the center.
i dont think anyone drives a boat from the back 3rd, it will turn out and get back endered.
no matter how much trouble it is to move your seat, if you dont do it and paddle a few miles, you'll never know the difference between the settings.
this topic has been beaten to death for years.
i know guys that buy a boat, get in it and love it or hate it, and i know guys that buy a boat, move the seat and braces etc, and learn the boat.
effort gets reward