FORGET BLUFFING AT 2NL.

just look at the stupidity of what you are saying in your post.

no bluffing, if you have the ace of harts and a fourflush with it, you can bet all you want, they still not gonna fold that pair of 4`s !!
this is obviously the correct line you should be thinking along. So WHY THE FUCK are you then saying

For some reason I always and up in spots where you just know a bluff would be the perfect play, but it works only the first few times. After that, the villians become so idiot that it becomes -ev so adjusting to this is not bluffing at all.
I'm guessing this is why you are losing money in the long run. You think micro poker is about bluffing. Its not,its about getting value from your monsters. As you move up it gets harder and harder to extract value with your big hands so you have to start adding in marginal hands and bluffs and semi bluffs. But at 2nl forget it , you are likely to be multiway , the villains don't have a fold button , and if one of them does find it , the likelyhood is that the others won't have a clue where it is.