I had Bridgestones on one of my FJR (2007). I also came from a Concours C10 and felt the Connie was easier to initiate a turn and keep a line in the corners than the FJR. It got to a point on the FJR I felt I was doing way too much work to keep it in a turn. I finally switched the tires to Shinko Ravens because I wanted to experiment with the brand plus I would be changing the tires out in about 5000 miles for a trip out west. What a difference, the FJR starting dropping into the corners much more readily and held it line with very little effort. I put 4800 miles on those tires before I swapped them out for another set of Ravens for an extended tour. The Shinko's turning characteristics remained the same thru the 4800 miles. I still have them for mounting on my new FJR (2008). I experienced a similar feeling switching out a Dunlop that came with the 2008 FJR. I have stayed with the Ravens. I am not the fastest rider, but not a slouch either. I am thinking the C14 Bridgestones are making a big difference in what you are feeling between the 2 bikes. I figure the C14 is about 40% thru the tire life which is when the bad stuff starts forming and remains that way until you replace them.
I am sure you will get more scientific answers from the forum, I was just giving you my impressions with Bridgestones.
YMMV
Willie