SB leak is hard to get rid of, especially if you play tight. You get excited that you actually get to play a hand semi-cheaply (which is poor reasoning). My recent rule is to only complete if there is one or less person calling before me. I'm probably still bleeding money that way but one step at a time.

When the flop comes out I usually bet the pot regardless of the board and lots of times get folds. If I check and it checks around, I'm betting the pot on the turn with similar success.

I'm at 21% VPIP too which isn't far from tight. I try to play some looser hands from late position when there are few callers before me. I don't want to be seen as tight at a table. Otherwise, AA-QQ gets folds every time.