I will show you guys what I did on my CG Ultimate. The rigging setup gives you equal throws on all 4 ailerons and does so using only 2 servos.

Bipes have a lot of strange tendencies. FWIW here is a list of bipes I have own and flown:

DP Ultimate
GP Christen Eagle 2 (had 3 of these)
Wild Hare 29% Ultimate
Goldberg Ultimate

You need to use proper mixes to get the most out of them. They will knife edge if you fly them correctly.