All good suggestions, yes I have contacted support. I have it connected to CPU_Fan1 and also the other wire is connected to its own power rail off the power supplier. I resolved the variable speed problem but the pump cavitates and it sounds like diarrhea for a few seconds and then everything settles down.
The problem is I have tried everything to resolve the potential bubble issue, let it run for a very long time while watching the temps and I just cannot trust it with the noise. So I put the air cooler back on it.