Ah
Here we go..
https://ricksfreeautorepairadvice.com/ac-pressure-gauge-readings/I guess that 100+
PSI is fairly normal if the clutch is failed and the system is in a quasi-static state...
From trying to pull the clutch I see that:
The pully will spin,
The isolator will spin
And the faceplate/ shaft will spin by turning the shaft attachment screw..
One too many degrees of freedom
So the burnt rubber smell (which I previously failed to mention) wasn't the belt, it was the isolator cooking and likely the cause of the rasberry-ish sound which I was thinking might be the orifice valve failing....
