I've owed the TV 11mm plossl, I traded it for a 15mm TV plossl for the same reason you're tired of yours, short eye relief. I use a UO 12.5mm (not HD) and it is much more comfortable to view through than the TV 11mm plossl. The HD probably has a bit less clearance since it lacks the volcano top design, I would think it would still beat the 11mm for comfort by a fair margin. Of course you do have to give up some performance at the edge of the field of view compared to the TV Plossls.
Joplin
Joplin