Chuck Cunningham from RCM was a proponent of lifting stabs. His designs; Druine Turbulent, Lazy Ace, etc. all used this idea. I remember chuck stating he felt lifting stabs helped with take-off roll control on tail draggers. I agree with him. Most of his lifting stabs consisted of a flat sheet of balsa with a spar acting as the airfoil high point and a couple triangular ribs on the front and back. So, you actually end up with a triangular airfoil and this seemed to work very well.