Well you gotta remember, it's a rotary engine....To much in either direction will cause a irreprehensible pop.
I personally think you should dump he 12A and get yourself a 13BT, i mean you can't go wrong with a 13BT, then you can imput some 13B-REW parts in there, and get yourself and easy 12 second street legal street practical Rx-7 sleeper...Wicked neh?