I ripped off the pads from my Philips electret headphones since the drivers are fubar anyway and put them on the ET1000. Circumaural goodness. Next step is to remove some of the stock damping. Birgir, when you had one, did you experiment with playing around with damping? It's definitely overdamped for me, too fast and too bright.
In other news, it seems I have made AmanGeorge a full-on Stax convert! He's the one who bought the SR-Lambda + SRM-1 Mk2 from me, and he prefers it to the HD800. So suck it, dynamics! A 30 year old headphone beat the best of the current production headphones. Long live planars!