So far bigger seems better when it comes to TBs.
The GT500 TB has done the best so far.
Jay(Blown04) got 680+ with his TVS and Dragon TB at ~21lbs with a mild tune.
This was with a mix of race/pump gas. He would have been close to 700 with a pure race gas tune with 21-22* of timing.
We are hoping to have the GT500 TB set up available later this year.
That's sick man. If you don't mind me asking what kind of fuel set up is Jay running?