Because of the IGBT technology the Einstein will do hyper sync only at full power.
Anything less and the IGBT circuit quenches the light just as it does in a Speedlite.
That's where the short flash durations come from at low power settings.
As you move the shutter speed higher curtain shadows from both the leading and trailing curtains show up on the image.
Hmmm, Its been awhile but I think pressing the test button on the mini fired the Einstein.
Mizer, because the Einstein power range is 8 stops and the AC3 has a 6 stop range the PW utility lets you pick where in the 8 stop range you want the 6 stops to fall. No way to get all 8 stops.
I have both ControlTL with powerMC2s and the Cyber Sync system from PCB, including Commander.
It you want to get the best remote control of the Einstein the Cyber Sync is preferable.
If you want to add Einstein to ControlTL then the MC2 is great. The biggest short coming I've found is that, when using a VML to power the Einstein, the MC2 turns the modeling light on with half shutter press, even if you have turned it off on the back of the Einstein.
I've pointed that out to LPA, hopefully they will get it to work the same way it does with Cyber Commander in future firmware update.