Ha, oh yeah. Forgot that. Not good. -5.1 bb/100. (That's big blinds, not PTBB's)
So I guess you're winning small pots and losing more than half of the big pots?
That's the real trick, isnt' it? I'm guessing that you're breaking even or winning for most of those 15,000 hands and just a few hands are putting you in the red.