There are issues with Schnick Schnack Systems LED-Kachel B LED tiles and Artistic License Artnet equipment - it was something about the DMX refresh rate that made it incompatible.
I have one System Power Supply 4E (with integrated Artnet interface) already in my trunk - so you can go on with your test setup next week.
If have done tests with PM and the Sys PSU 4E with 60 universes. You could not really see any latencies and movie played back totally smooth...