Loose Passive Home Game

[chaas4747]

My friend has adopted having a poker night 1 night a month at his house. He and his group have limited it to two NLHE 2 table tournaments each time. Buy in is small $20 or $30, with no rebuys. I am a limit mostly a limit player (and mostly play stud or O/8). Most of the players, play cards but really don't study the game. They are what I would categorize as loose passive, call a lot of bets; really do not raise that often, etc.
I am not doing well at switching my game to accommodate this type of play. Here is my question, am I better off abandoning pre-flop raises, waiting to see if I think I have the best hand after the flop and playing more "post flop" poker. The reason I am asking is it seems to me, in this type of game, my pre-flop raise is really not limiting the field the way I would like for it to. I am still in the pot with 2 or 3 players and if I do not hit the flop, I really can't bet into the pot without being called down by a hand that should have never been in there in the first place. Any suggestions?