Well I balanced it at 3-1/4 inches and in the manual they say I could go as far as 3-1/2 inches without problems, so I am pretty sure I am not nose heavy...
I was at 2-3/8 inches at the beginninng.

I will try the 11x5 prop to see what happens

Thanks for the tips



edited to add: what idle rpm should I score with the OS 46AX? what peak rpm is logical with 5%nitro and #8 plug? I think I am having problems in this regard as well...