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If you compare the t.1 flash duration of an Einstein and a speedlight at full output - they're pretty similar. Colour mode and Action mode are the same at full output on the Einstein, but in colour mode the durations are slightly longer meaning that you could get slightly better performance at lower outputs in colour mode if you were needing to reduce output. The longer duration in colour mode might just provide some benefit.
Back to the speedlight.. at full power output (not using FP mode) these are slightly faster, or have a shorter duration.. and without any PW ControlTL units and just using the advanced FP/(HSS) shutter timing in the camera with Quantum radios I can get 1/8000s sync with these on a full frame D3x. I could do this five years ago with a DX camera and slave cells or Cactus triggers, so I'm surprised that it seems so difficult to get the Einstein to work with the added sync retiming.
I don't buy into the FF or DX sensor differences because at all shutter speeds the exposure durations need to be the same - and with performances at higher shutter speeds (1/8000s) the durations will be practically identical.
It might be best to ask Mr Kris about his settings, as he seems to be having it working..