Since I'm one of the "old" guys I'll tell you what Jim KIrkland wrote in an article in Model Airplane News
many years ago about trimming a pattern airplane after he won the AMA nationals. He apparently did a
lot of experimenting and found a flat stab has a dead spot right around neutral and the airfoiled stab has
a much smoother response. The shape apparently has little to do with how it reacts so he used a diamond
shaped stab on his Intruder which is much easier to build than a rounded airfoil.

tommy s