Against the fish you gotta overbet hard, maybe your trying too many tricky plays ( which is acceptable at 1/2NL) but not in the fish pond of NL50. Made your set of 2's in a $2 pot? bet $5 ( maybe a little exateration, but make it very -EV for anyone with a hand which will improve over 30% of the time to call) If you underbet too much eg. giving them 3:1 on 4:1 draw, your not making too much profit, especially if they hit their draw and win a river bet, its almost dead even. Hammer the fish