Billy's new ride

Actually, a little while ago, Chris Kaufmann posted on the NMRA messageboard on Billy's behalf that he wouldn't be racing in the NMRA series anymore. He said that the weight breaks given to the nitrous cars would make them unstable, due to uneven weight balance of the car front to back. The message has since gone from the board (I think that they clear them after a certain amount of time). Whether his position on this will change or not is yet to be seen. I don't understand why he can't get the weight balance the way he wants in his new ride, or why he doesn't just race at his current weight, 'cause I think that he'd still be competetive.