I was thinking abotu this some more when I rode my 1150GS to work this morming, quick things
Take the panniers off - remove a varible - do a road test
take the windshield off - remove a vaible - do a road test
do the above two one at a time so if there is an effect you know which one it was
Is the direction of rotation of the tires correct? sounds like a silly thing and I dont know whyit might make a difference but some thing has changed and you said that had changed tires - some thing easy to check
I like problems like this, something to think about - thanks Liz for reviving it
Moments before you die, your life will flash before your eyes - make sure the film is worth watching - my Grandad
Don't go gentle into the long final good night from which no man has yet returned.
Moose Antlers need love too.