IMHO in these kind of games preflop raise is only a good thing if you want to build the pot. They will not fold their hand because of a raise. If you want to put out the players defending your hand, raise the minimum. My experience shows that they will not give you 2 BB or will call almost anything. If they are limped in earlier position, it is hard to make them fold.

Instead you should play them on the flop. They more easily fold a hand when they see they didn't hit it. You should judge your bets by the flop and their reactions to it.