ORIGINAL: DPKII
As for it being twitchy. In level flight, the slightest movement of the elevator will cause a fairly violent pitch change (more so down than up ). I thought that may have been due to the forward CG. David
David,
Check that the centerline of the wing and stab are lined up correctly. If the stab is not in line with the wing it can cause a condition called "porpoising". Also check that the thrust line of the engine lines up with the wing and stab (just up and down, out thrust is OK).
George