Rusty - Agree, at least we know now. And yes, a bit more RPM's than I was looking for, however the cam (Erson Roller) is unique match for this build. It's power is definitely coming in at a lot higher RPM and the motor was still building power up to the point the rocker broke.
I don't think there is a issue with the valve train, harmonics or other item. We are thinking these are knock off T&D's based on some inconsistencies in the build of the rockers the more we look at them. Items such as roller pin not pushed in all the way or no markings - Internet purchase. We bought the second set directly from T&D.