I am running the red dampers.

Actually, I did some closer checking of the trashed rotors. Previously I thought one did not contact anything , but then I noted that the underside of the rotor (the one with the cracked ball link) did in fact scuff the top of the horizontal fin. The other rotor (non broken link) was the one that really smacked into the tail boom, it actually struck the boom by getting under the horizontal fin.

Although it is still unlikely, it looks more and more like it was the cracked ball link that set off the chain of events