i added right thrust even tho the instructions or the planes
didn't call for..or i coulnd find it.
i set up good so , it requied little or no trim
flew like it was on rails and required little or no elevators input
when inverted. same with a knife egde.

i bashed it a little tho.
diehedral out
clipped wings (total 3")
extended rudder.

i don't trim the elevators as the fuel gets empty.
so..the 12oz didn't effect it that much.
or i gotten comforatable with the plan that it didn't effect my flying.
eventually the CG was set back as far as the planes allow (empty)