Quick question though: are the foam ring pads you're talking about ones you've physically removed from the inside of the existing HFM pads? Because my ear touches the driver on the HE-6 and I need to get some more space there for comfort's sake. Corollary question: anywhere I can by said foam ring pads separately, or something else with an equivalent effect?
Said rings can be found on the velour pads (not sure about pleathers). The velour pads are $10-$15 from Hifiman, you could just remove the rings. Or you can just use something else to get a bit of lift on the pads.