The good news - based on all you've written, I have to say I think you have both thrust and CG issues....that particular airplane at the flying weight it is at may NEED upthrust at the engine and DOWN elev trim, with the CG moved forward. I can explain why I think that, but it will take a lot of typing. Basically, since you cannot move either the wing angle or stab angle (decalage) with reference to each other, you are forced to "fake it" with moving the only things that can simulate decalage changes...and that's engine thrust, pitch trim, and balance.
PM me w/ your email addr for a comprehensive trimming chart.