One recommendation I do have is to raise preflop a standard raise. By this I mean raise all your big hands (AA, KK, AK, QQ, AQ etc) the same amount. Personally, I do $1.50 or $2 (preferably $2) at the Party 25NL tables. I slow down and raise $1.50 if everyone folds everytime to my raise. I think you're getting too many callers preflop on your big hands. I find that this trick masks your hand strength as well as isolates for postflop play. And as the other FTRs have already said, don't overplay your big pairs. Yes an overpair is strong, but easily beatable. Play strong on the flop and go easy from then on (of course, play on reads).