I tried going back to v2.0, but FYI, it CAN'T BE DONE (at least that I can figure out, even going back to 1.08 first).
I did adjust the gains to the v2.0 defaults. I'll see what that does, if anything.
I DID notice, while staring at the Assistant that if I moved my Tx antenna near my compass the compass values changed dramatically. That disturbed me. I re-oriented and re-attached my TS 352 pointed more out the back with blue beam 3 turn CP pointing down and away from the compass.
I'm hoping that one or both of these changes helps me get a stable hover on v3.0.4. Otherwise I've got a very expensive paperweight with propellers.