Had more time with the new setup. Cold start resonance is gone. Cold start reverse whole car shakes is gone. Either it's the new puck or the arm, I can't tell but either way much happier with the car now. The only negative now is a slight nvh in my passenger door. Perhaps it was there before and I'm driving more with the stereo off? Maybe. Considering sticking some foam in there to tighten it up.
Car sounds a bit different accelerating.