Having disassembled & reassembled these pods, examined the design of the rebuild kits, and bench tested them next to new pods... I stand by my original statements. I also do not believe the rubber stretches over time to significantly change the stroke on the dual-chamber pods. Note that he doesn't specifically answer the exact question, btw.

However, I would love to get a second or third opinion. I wish I had videoed or photographed the difference ten years ago when I did this. I'm not interested in buying another rebuild kit, but if someone sent a kit to me, I'd be willing to document / photograph / video the "reduced travel" phenomenon.

UPDATE: Turns out I still have two unused repair kits for the dual-chamber large lift portion. I also had a disassembled pod to inspect. From a quick test, I still believe my original claim of reduced stroke is correct. However, I will work on better documentation this time, including exact measurements of the difference in stroke. Stay tuned.