Thanks for the response.
I've put the M569 command in my slicer start code and it works fine.
I've got the printer up and running and all seems to be working.
I even did a test of a failed power supply: I used the reserect.g as a macro and had the printer resume from where the power cut off pretty much dead on.
I gotta say, overall surface finish and lack of noise are are big improvement.
(The loudest parts are the PS and HotEnd fans.)