Claude, the loss of the trail reduction via the smaller tire is the down-side, but our front wheel with a 155R15 and your trail reducing bottom fork tree may be the hot set-up for the 1200's...unless a leading link is more someone's cup of tea.
Dave, I'm glad you found what "Gremlins" were the culprit with your speedo, and that the wheels are working out for you. Good thing you went with the powder-coated versions with all that road salt!
I have also found that actual tire size varies according to brand. As with most modifications the learning curve never ends.