double barrels are the only thing that works in LHE at low stakes...sometimes all three barrels are necessary. who is folding a flop for one small bet in a limit game? they should, but they dont.
oh, and by the way, i think WAY too much for .25/.50 and you are probably doing the same for .15/.30, fwiw. if someone bets, they likely have something that beats third pair...or has the equity to improve beyond third pair. save your bluff catchers for HU pots.