It doesn't look that bad to me. The "waves" are probably due to the lack of rigidity you noted. The scalloping is pretty much what you'd expect from a step-over that's 1/10 of the tool diameter on a finishing pass. If you want that to go away, you'll need much finer step-overs, like 1/33 of the tool diameter. And even then, you'll notice it in steep areas.