Isn't it supposed to be moving the CG backward or reduce the wing incidence to reduce the down elevator input during Inverted flight[sm=spinnyeyes.gif]?
I am not sure how the wing is mounted, but wood fuselage can be trimmed a little to change the incidence. I tried it on a couple of planes, but be really careful not to trim too much. I used very slow sanding method. (sanding paper on glass bottle, pvc pipe etc). Took a long time, but worth it.
I suggest having at least two incidence meters (I had one and borrowed one).
Before you do anything, check the incidences of wing and horizontal stab. I believe the plane should have the horizontal stab at 0. Contact Cermark for this info also.
http://www.nsrca.org check the trim chart before you try the change anymore. You may have to put the thrust angles back to where they were.
Good luck.
IP