Albert, you may have solved your problem by now...I just found your post while looking for stuff on the H9 Easy2 trainer VRTF. My best flying plane at present is my CG Tiger 2. Mine was from a kit, and I just looked at the plans and the CG is 3 5/8 to 3 3/4" from the leading edge on the kit plane. I have not seen the ARF. My plans call for the battery to be installed on a tray that fits under the fuel tank and this apparently helps a lot. My first engine on the Tiger2 was a Saito 56, and I still needed 4 oz of lead in the nose. and I hated to carry the weight, but it flew great. I have since bought a Saito 72 and need no lead on the plane. It balances slightly nose down and now has the power to do good verticals. It won't do a knife edge, but does good snaps and spins. I enjoy practicing touch an go's and crosswind landings as it is so predictable. All in all, just an enjoyable plane to fly. If Carl Goldberg knew the kit plane balanced better with the battery under the fuel tank, seems like they would have made provisions for that in the ARF. I would think about cutting a small hatch under your fuel tank inside the fuse, then putting some light ply there to keep the strength up after you slip in the battery. Maybe some of this will help.
George Here