put apprx a 1/4''X1/4 x the width of the fuse spacer at the back of the gear were it mounts on the fuse, this angles the wheels forward about an inch, worked great for me, you may have to increase the bolt hole size in the gear to allow for the angle.

How did you manage to get the c of G so far out ? A plane like this must be hung up and balanced 'bang on' before flying, 3'' is really good.