I had the same problem, I figured out what they did that is causing the problem. Look at the fuselage where the cabanes screw into, you'll see the hardwood blocks that they mount to. The holes are probibly drilled too high. After I redrilled the holes in the blocks center, everything lined up perfect. I guess that the holes were drilled off-center buy accident and not noticed by them. I sat there and thought all the same things too, I only noticed it when I was disassembling it to see if I had done something wrong. I caught it and made the day. All my incedences are perfect.lower wing: 0 , upper wing: -1 , h stab: 0
Hope this helps you guys
Ray