Gary, you are correct in asserting that the HM oils are designed to swell seals, particularly valve stem seals. But it is a far better approach to clean up the seals, with ARX before going to the last ditch effort of trying to swell them. By first removing the glazed crud off the surface of the seals the seals will likely rebound on their own. If not after an application or two in extreme cases, then try the HM as a last resort. At least the swelling agents of the HM oil will act evenly across the surfaces of the stem seal.
Also, why would one want to swell the seal during the cleaning and rinse phase when deposits are dissolving out of the system.
Spintman, you likely have more application experience than anyone I can think of using ARX. I have followed your posts for almost 6 years. You are correct in that ARX works best with both heat and oil flow, which highway driving does better than stop and go driving with alot of idling or low rpm operationality.
I thought that the use of the pizza box covering part of the radiator during frigid cold driving conditions was great. Just a crafty way to get keep the motor up to full operating temps during winter months, especially helpful in short trip driving to maximize ARX effectiveness.
Frank has always been proactive in his instructions to provide the best possible results, while implementing the highest reguard for cleaning a motor safely.