Doug, thanks for the spellcheck, I was sure someone would know ;-)
Satch, I'm sure you could have the Kiseki re-tipped for a nominal amount by van den Hul or SoundSmith. It's a good cartridge and would be a nice back-up for the Lyra (or maybe vice versa ;-)
I know you have a JVC-equipped Studietto because of the (quartz) 'lock' indicator on the front panel (the Pabst models have two holes in the front panel to adjust the speeds manually, using rheostats - nasty!)
I also have my TT on a target shelf, but I'd stay away from glass or granite (less than 2"thick!) because they RINNNNG! And those plastic feet are a BIG problem (more so when resting on a glass surface!) So get a nice MDF or hardwood shelf and some cones; then you can retry the sorbothane. Even the Audioquest half domes work well if installed properly -- I suspect your poor results were due to other factors. You can read more comments here, about a tenth of the way down the page:
http://www.high-endaudio.com/RC-Tables.html