I always use VORTEC airfoils. Those airfoils give you the opportunity to always fly constant speed, no matter what throttle you have. The same speed is on the low throttle as on the max.
It also gives you the ability to not use flaperons. The covering does it all itself.
Chris
P.S. You won't find that airfoil in the internet resources. IF you want it just write it over here and I will tell you how to draw it.