Is your CAP balanced properly? If not, do it.
Is it trimmed for level flight with no control input ( "look Ma, no hands" )? Did you have to apply a lot of UP or DOWN elevator trim?
If not, trimmed, make sure you trim it.

If it is already trimmed and well balanced, what happens on inverted flight? Do you have to apply up or down elevator to keep it flying level? If so, you might need to change the wing incidence, particularly if you have had to apply a lot of trim for level flight upright.

Luis