Where is the leak in my game?

Yes, I know there may be several, but I was hoping people could give me whatever insights they had.

I am currently at -0.71 BB/100 Hands

Here are my general stats from PokerTracker:

Game Level: 3/6 (6 max)
Total Hands: 2551
Vol. Put $ in Pot: 21.76%
Vol. Put $ in From SB: 31.88%
Folded SB to Steal: 80%
Folded BB to Steal: 63%
Att. to Steal Blinds: 20.12%
Won $ WSF%: 34.42%
Went to SD%: 28.40%
Won $ at SD: 53%
PF Raise %: 9.64


I try and play fairly tight and aggressive, and I avoid one major leak by not cold calling raises preflop unless I have premium enough cards to do so (and in those cases I almost always raise).

One thing that strikes me from looking at these stats is that I may be folding my blinds off too much, and also might not be attempting to steal as much as I should. If that's right, does anyone have any recommendations as to what those percentages should be around, if mine aren't right?

Also, I think my showdown win rate is decently respectable - 53%. However, am I going to showdown too often? Is 28% too high?