Graham...try riding the bike with the handle bars raised before you go down this path...think you'll be surprised
Bit late now to ride the bike I had at Blackheath, but if I get up to the GC in June, and if you haven't modified your bike by then, your welcome to take bike 2 for a ride, it's set up the same, but with the JM seat and not the Corbin
Cheers Dick :)