I have just test flown an Arizona Models 1/5 DR1 and have found that the plane is very pitch sensitive. I am unable to trim the plane for hands-off level flight. If I move the elevator trim on the transmitter just ever so slightly, the plane will either climb or dive depending the direction of the trim change. In flight, I have to hold up elevator constantly in order to keep the plane from diving, with the elevator in neutral position. The CG is per the plans and I have added about 1 degree of down thrust on the engine. Any suggestions. Thanks