As I stated in post #2, 0 degrees incident on everything, and an adjustable AOI on the stabs will most likely work just fine, especially if you keep it light. If you really want to nail things though, then you need to walk the walk, and build some small testing specimens as I already stated earlier. We did this often some 25 years ago while I was still employed at Dryden Flight Research Center in Edwards AFB CA. We would test fly these specimens from on top of the loads lab that was the tallest building NASA had out there at that time, we would make adjustments on our glider versions until we had a good starting point, then we would move on to R/C versions and even full scale application from there. There comes a point that the designer can only speculate so much, the rest is getting in there and doing it... I wish you the very best on your build!

Bob