Hey, when were you flying my plane? Everything you described is exactly what I had. Even the take-off thing.

You mentioned that you used #10 washers on the left side, did you use just one washer on the top and bottom of the left side or multiple washers? If just one washer on each how did this result in any down thrust? I used one top and one bottom (about .040 thick). Since the engine is mounted at a 30° angle, the washers will cause a little down thrust. Just do the trig.

When you moved the CG back did you have to reduce your elevator throw? Yes, I moved the linkage one hole out on the elevator. One hole in on the servo would have a similar effect. Be careful with a more aft C.G. If you go too far, it will become unstable. Only trial and error with reveal the true limits.