You might want to tighten up in EP.. I know I needed too when I moved up from 100 to 200/400. Position gets more and more important then. Playing 20% of your hands UTG is probably -EV at higher levels.

Hmm, just ignore that last statement btw. My 400NL stats are 23/12 overall, 23/16 BN, 16/12 UTG.. (w/r 11ptbb/100, running good..)