The 208ZR Dunlop's are superb tires, I used to run them on my TL1000S.
Michelin's Pilot Powers are supposed to be as good or better.
I was getting a maximum of 2000-2500 miles out of rear on my 425lb TL under aggressive riding. If you can make them last much longer on a 500lb B12 I will be surprised. Even though they are fairly cheap for premium sport tires, commuters expecting 5000-6000 miles out of a rear will want to look elsewhere.
Ride On, Ed.
2005 GSF1200SZ
1983 GS750ED