I run 7.5PTBB/100 at $50NL after 26k hands. Getting ready to move up soon....just working on my pf raising and post flop play for a bit and then I'm gonna move to $100nl. At $25NL I was 11PTBB/100, 27k hands. I don't think either of these are the best possible, but I would guess that they are certainly better than average.