The thing is, and I've preached this, LOL, is that "too high" voltage is almost always a matter of the VR not being at battery voltage. This means voltage drop in the harness and ground systems.
However, some? many? most? solid state VR's are temperature compensated, and in fact if they weren't would likely vary with temperature anyhow. So make sure you check it with system warm and battery "normalized." On the older Mopars, there's a chart in the service manuals that equates temp to charge voltage.
I understand your frustration!!! This is a common problem
