Hey mojo, I have tried you suggestion about using a 11x5, or 11x4 prop on my MDS 40. The 11x4 just didn't seem like it had any um pf at all, I was really having a handful when I was making approaches. The 11x5 seemed a little better but a couple of touch and goes seemed like I would never get that thing back off the ground!

I am not sure if I need to try maybe another pitch or maybe I need to lean out the low end just a little more. The instructor Sunday didn't want to adjust it but he said it needed it.
What is the formula for picking props?
DIA x Pitch = % power?

I have forgotten how much did you raise your stab? Did you just use some Balsa or what to shim?