Sounds like you talked a bit with these guys. Since they were hooking up better than you, why not try a similar set-up? Its atleast a starting point.
I think at 150lbs, the +10, w a bar might be much. But then again, every rider, and track is different.
Could be done. Ive done it in sand.
350, 2-5 override, methanol (stocker) carbs, +6 w a bar, 22" ultralight haulers blah blah blah...but that was long ago.