I just finished a session @ 50NL and flopped a set on a board with two clubs. 3 players in the hand with lost of betting. One guy called my all in (he should have known very easily he was drawing to a club) with TPTK flush draw.

It happens at all levels between yours and 50NL. You are beating a lot of hands, many of which will call off their stack against your flush. At these limits especially, get it all in sooner than later.