Seans - I'm running the Miro replica M6 wheels which I got in a swap with another six owner who wanted to go back to stock for tradein. I had the same issue with a little vibration even after the hub-centric rings so I took it to a good custom tire/wheel shop that performed "on-car" high speed balancing, which completely fixed it the past couple of years. This shop now gets my business and I run non-RFT Michelin pilot super sports. Good luck.
'07 650i vert, beige/jet black, sports & cold weather pkgs, comfort access, premium sound, sat radio, Miro M6 wheels (with non-RFT super sports), M6 spare tire, tint, windscreen, triple resonator delete, 5W bulbs, corner bulb delete and m-tec fogs
'11 Acura MDX Advance with Entertainment pkg for the family - no mod's