Perhaps you'd consider making a few mods to this already pretty good plane. Many have done these and it seems to improve the flying.

Put real ailerons in the outbard 1/2 of the wing served by a micro (HS 81) for each'

Enlarge the tail feathers.

Shift the horizontal stab to the bottom of the fuse.

My 4* flies with no rudder/roll coupling, has very crisp roll and good snap.

BTW I fly it on 18 Sanyo 2600 NiMH cells and a MaxCim brushless.