OK, more different set-ups tried.
I've come to like a 3S 910 and an APC 6x4. I've also cranked up the throws.
The thing is a riot with the CG about 3/8" behind the recommended position. The thing will almost loop in its length!
I have the battery just press fit into the foam which is no longer adequate I found out when I ejected the battery after a full throttle dive and a full up elevator loop that ejected the battery and sent it at least 120'-130' away! The wing was at only about 10' AGL when it happened too. This thing is a blast and it went together CHEAP! Great bang for the buck!