Test drive was good in one respect...the sound I was hearing appears to be gone!
The not-so-good thing is squishy pedal feel. It is unrelated to the pistons and it's my own fault...didn't block the brake pedal before the work, so there is likely air in the DSC unit. Will see if my INPA daten's cover my car tomorrow so I can execute the factory procedure (
chadillac2000 indicated in
this thread selecting E87 worked and he was able to use INPA to flush all four corners to perfection). Still need the Motul for that and it doesn't get here until Monday.