Hi rare_heat...welcome to AC

I see one of your arms has the Michell counterweight, the other does not. Did it benefit performance having it?
I, too, run a Technics Sl-1200 with the Origin Live adaptor....now shorn with an Origin Live Illustrious Mk. III tonearm.
Despite the $3000 arm and every upgrade from KAB (and replaced stock feet and platter mat) I can only get similar levels of performance from it versus my venerable
JVC QL-F6.
British-based Sound HiFi (owner Dave Cawley) thinks it may be the stock Technics regulator...maybe he is on to something there
http://www.soundhifi.com/sl1200/index.htm(btw, I have the Sound Supports armboard adaptor for Linn/JELCO arms, too, and they are very nice looking lightweight aluminum. I've not used it as yet (need to get a JELCO arm nut not a size they have down at the hardware store), but it's quite handsome in a different way than Origin Live's.
Are you in the UK?
John