Even thou the motor is backwards mounted, you will be adding the shim or angle to the left side, looking at it from the rear. This adds left thrust to the prop which will help push the nose right.

Note on your hop up motor,3200 kv. You'll have to run a smaller prop on it, like a 5x4, anything more is going to be a huge amp hog. You'll have lots of speed, but will take a bit for it to get there, and you will loose some thrust. That's more of a motor for an EDF or a heli that uses gearing.

Your 1800kv motor if it can take it would be a lot better choice by jumping the pack to a 4S from a 3S. Just match the prop so that your amp draw is similar to what you had with the original set up. That way you won't damage the motor or esc.

Something else. I saw your pack info, if the pack is a 20C pack it's only good for 22 amps, if it's 15C it's good for 16.5 amps, 10C is 11 amps, so anything over that will put a hurting on it. Rule of thumb is to run 80% max amp draw for the packs capacity for best life of the pack.