You definately need a 17t clutch bell. Racers Edge makes a good narrow one. You might want to think of adding 1.5-2 ozs. of weight in the nose. I use 1 oz. on my short chassis and that works very well. I tried 2 oz. but it was too much with the TZ might be better with a BB though.

When/where's the next race after this coming weekend?