Unexplainable Transmission Stutter... help?

I still think your sniffing up the wrong tree. You said the trans was fine before the cam swap. Ok, what did you change and R & R. Intake manifold was removed, could be a sealing issue there. A lager (i assume) cam was installed, that can cause lower vacuum which can require retuning that AVS.
I wouldnt overfill the transmission. If its at the full mark hot idling in neutral its fine. Overfilling can cause the fluid to foam and it will cause more issues.
Are you running the same timing as before?
Its hard diagnosing a problem over the internet.