The angular difference between the wing and tail is commonly reffered to as the decalage angle. 10 degrees is CRAZY high and totally explains the flight charactaristics you encountered. Shim the wing and shim the tail and keep in mind the engine thrust angle. Get it into spec whatever you need to do. The fuselage center line means diddly. It's the angle of the thrust line, the wing and the tail surfaces that counts. The centerline is just a convienient way to provide a basis to compare them.

I doubt if just shimming the wing will do the total trick. It'll certainly make it better but if that -5 degree angle of the stab isn't proper then you'll still have a big problem.