Found a local buyer and my dealer is going to mount a new set of tires for a very reasonable price so I will swapping out my RFTs after all. Decided to try the new Yokohama ENVigor UHP AS tire just released by Yokohama.
Colonel (Retired), US Army/Hagerstown, MD
ED-01-10 2010 Z4s30i AW/Beige/Burl/ 6MT/SP/PP/CWP/NAV/ipod/USB/CA
2011 335d BS/Oyster/PP/CWP/NAV/ipod/USB(Daily Driver) 30+ mpg
1988 635CSi black/tan/5MT/Dinan chip/B&B exhaust/RD sway bars/Bavauto stress bar