I say go up a size. I like my seat to be forward. If your all good with it back than keep on keeping on. If your on the light side of a playboat it flatspins better, blunts bigger, loops higher, gets less effected by currents. If your on the heavy side it catwheels smoother, and its easier to boss around. On a side note for the not so shy of hart, if you go the next size up and you are on the light side... Get the heat gun out and smash down some volume. (automatically voids warranty) On the other side, Its all ways easier to resale the md size than the lg size. I hope I have confused you real good!
Bound is boatless man