Hey - give it a try! I was happy enough with the vertical fin alone to stop the experimentation. The using a DEPS system, and a YS 160 with short Hatori pipe, 2 cell lion mounted just ahead of the landing gear plate, the Abbra had 7% up elevator mix to rudder. These two pictures with the tape measure are the "cut" and final dimentions of the fin (for me anyway).

Also attached is a picture of the fin I installed on my Aggressor.
Thanks,
Jim W.