Separate balancing the plane (CG adjustment) from the angle it sits at on the ground. The Avistar should have it's center of gravity 'BALANCE POINT' at a distance between 25% to 30% back from the leading edge of the wing to the trailing edge of the wing. Having fixed that, the plane should rest level to slightly nose down on it's gear when it is a tricycle gear setup, 35 to 40 degrees is way too much. Try bending, adjusting, or replacing the gear wires until you get it right. If for some reason you must add weights to the plane because the CG is off (note - not related to the angle at which it sits on the ground), it's OK to just tack them on to the outside, but do try to relocate radio gear first before adding weights.
quint