moving up

[fuzz66]

ive been playing 4$-8$ limit at foxwoods now for about 2 years.during that time ive managed to build a modest bankroll, with one very good session in wich i doubled my bankroll a few weeks ago, wich brings me to last week.during 2 24 hour sessions, i lost it all.on tables where i should have done well[3 or 4 LPP'S and 1 or 2 maniacs], time and time again i was sucked out after being ahead after the flop. i cant get into every hand specifically,but i had 4 boats cracked[2 by quads]1 nut flush cracked by a sr8flush, and numerous trips broken by runner runner or miracle rivers, while my strong drawing hands never got there time after time.the only hands i was able to win were against the better players on the tables,while giving it back to the tourists.ive been a student of this game now for about 4 years, studyingbooks from sklansky, malmouth, krieger etc. as well as this site and its excellent forums. while i believei am still an intermediate player, i also believe ive aquired enough skill to beat these low level games, yet my bankroll tells another story.evaluating my play on those last 2 sessions,the only thing i can come up with is that maybe i should try playing higher limits[10$-20$, 20$- 40$] before giving up entirly.can anyone give me some advice on my problem?