It could be that you're just on a bad run, too. I was absolutely destroying my NL100 game but lately everything has gone wrong. My big pairs are getting cracked by sets, I have a *great* second-best hand a lot, I've slow-played monsters into people turning/rivering bigger monsters, my bluffs aren't working, etc...

Shit happens. Either stick with it or go back down and destroy the NL100 game and then try again...