Guys, yes it is a form of TBE, the swirling pattern it's flying in is a direct cause of TBE. Trust me. I had it this morning. Put on some new blades and sure enough around and around she went, combination of blade tracking and sticky flybar. Now for the remainder of the problem I would say it is just a matter of trim, maybe some binding issues however the bulk of it to me still sounds like TBE like I was experiencing this morning.
The backward flight is most likely a balance issue, COG messed up, or it could be a trim issue.