We've got the coupler in, changed the SC oil and the noise was still there - only when idling. (You were right harofreak00, very hard coupler - worn or new).
Thinking we should continue on with the Super Charger, we closely listened to where the noise was coming from - and it'* either the idler pulley or power steering pump. The tensioners seem fine. So I've ordered an idler pulley and may end up ordering a power steering pump too. (Ran new PS fluid too).
We're not completely ruling out more issues with the SC, but feel we should be addressing the component with the noise first.
Should I be moving this thread to another forum?