Dear @richmos : I think that rigth now you AT TT/tonearm combination is fine to stay with. The tonearm design looks as one of the best tonearm ever made that's the Technics EPA 100MK2, even your AT tonearm comes with the best VTA mechanism ever made where today 20K+ tonearms not even dreams with.
That VTA mechanism was designed by Technics in the very old times of analog audio. So for me stay with and before you change it ( if you do in the future. ) your choice for a better wuality cartridge is spot on.
I agree with the gentleman that recomended Nagaoka cartridges that's like AT or Ortofon manufacturers an " old " way experimented manufacturer too.
You must try this one and I'm sure you can't go wrong with:
https://www.lpgear.com/product/NAGAOKAMP300.html
Due that the AT tonearm designs is a removable headshell design you can match the cartridge with the tonearm for improved quality performance levels.
You can use a different headshells than the stock AT, you can choose for magnesium build material to wood one or even headshells of blended materials.
With different headshells the kind of sound you will listen is different too.
Even if you don't want to test with other headshells you can improve the sound changing the headshell stock wires for better quality wires.
Anyway, as you posted: "
lot's of information for me to sort through and research .""
Regards and enjoy the MUSIC NOT DISTORTIONS,
R.