I've had some frame pacing / timing and GPU load inconsistencies since the install but I think there are other things at play here as well. I've DDU uninstalled the driver and installed clean (which I did not do previously) and also deleted all system and document folders relating to SteamVR and reinstalled that also. I'm about to go back and retest to confirm I do not need a system wipe. Something's up and I cannot stand the anomalies when driving in VR.