Isonoe feet do make a difference, don't buy the techie boots, they mess the sound up.
Mats, the Oyaide are nice mats the BR12 might be a good alternative to the stock one. I use the previous metal version and weight which work very well with my other choices for my Technics.
Arms. Tried Jelco, tried Origin Live, Sme, Rega, Triplanar, Graham. Currently I use a Triplanar.
PSUs tried most of them, the Paul Hynes Sr3 or Sr5 are good choices, but much depends on the other items used as PSUs do bring a change to tonality and detail, so you may get better results with Origin Live, or Long Dog Audio. This will depend on your arm, cart, mat choices.
Replacing the platter and bearing do make a difference, but doing so now will be difficult as the time with most choice was a few years back. Mike New bearing or platter work well, Funk firm bearing is good, the current Funk platter with Funk arm worked well, but with my other arms I prefered the mk1 Funk platter.
I have moved on from the Technics, still own it, but prefer my AMG Giro, by a massive margin. Its the best analogue playback I have ever had.
Back in the day I wrote a few reviews about the Technics options
http://www.adventuresinhifiaudio.com...nics-12001210/
http://www.adventuresinhifiaudio.com...ong-dog-audio/
http://www.adventuresinhifiaudio.com...ic-down-under/