Before you invest too much in the RPM, I too would suggest trying out some different boats. I started in a ca 2000 Dagger Ultrafuge which admitidley is way to small for me, but the outfitting is very uncomfortable. The seat is bad, the thigh braces are bad and the backrest is bad and the bulkhead is bad. It has had alot of foam glued in various places to help out, but it is still just an uncomfortable boat. Compare that with my wifes Remix with BadAss outfitting, and it is amazing how comfortable it is. The RPM is an older boat, so it likely has the same bad outfitting as the Ultrafuge. If you try some other boats you may find one that is comfortable inspite of your feet, and your feet may not be the problem at all.
"If I'm not there, it means I'm dead...or late!" General W.R. Monger