Everyone had some good advice, but really it sounds to me like you should find some new games with more serious players. People often tend to forget how important game selection is. I think of every table I sit at as a puzzle...beating a game is like solving a puzzle because every table requires a different approach.

So....like I said before, I think you really need to find a new game and in the future when you sit down at the table, sit back and observe for a while and then ask yourself, "what's the formula for beating this game?"