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
2016 518ixdrive/MSport AW/Ivory White
ED-01-10 2010 Z4s30i AW/Beige/Burl/ 6MT/SP/PP/CWP/NAV/ipod/USB/CA (retired)
2011 335d BS/Oyster/PP/CWP/NAV/ipod/USB(Daily Driver) 30+ mpg