Forever, I used micro-mesh then Maguires Scratch-X. Regardless of CA finish over wood, plastics, or ebonite. (I have made quite a bit of ebonite). Sometimes, when I make a mistake, usually not sanding parallel to the body, I get all done and see scratches, more visible on dark surfaces. Last summer, I decided to get the 3-wheel buffing system from Penn-state, and have to admit it, but it seems to make everything pop a little more. So I think you are already on the right track!
Two observations I can not stress enough. Wet sanding will hide scratches. Make sure you dry off to see if there are any scratches before progressing finer. Second, I ALWAYS have on extra magnification. I love my Donegan glass visors. My opinion there is, if I can get the scratches out with magnification, they will not be seen without the magnifiers.