I'm not an expert on this at all. But I'm guessing it comes from your cards and not your bluffs. The reason is because they don't believe you and pay you off. Many times people will play back at you with nothing at the wrong times.

Bluffing at the small pots is probably just what keeps you alive. But in this small blind format, I would guess that it only keeps you afloat and establishes your laggy table image. I think it's the big hands that make your money (it doesn't have to be a full house, just pocket aces will do).