The infamous front end wobble no one has come up with a real solution but it occured on my bike with the tyres being about 50% worn. I just put up with it (50mph + - 5mph). However I just put some m type bars on the speedie at first the handgrips level with the ground felt a little better. Rotated the handlebars up by a few degrees and the wobble was far more pronounced. rotated the bars a few degrees lower than horizontal and bingo front end feels planted on the ground no wobble unless let go of handlebars and the the wobble is back (at 50mph).
My guess is the m bars when rotated a few dgrees below horizontal put more weight on the front wheel stopping the wobble being felt.
It is not a cure but the bike handles so much better that I am leaving the setting a few degrees below horizontal.
I guess I need new tyres I have 24, 000 kms on the stock metzlers and hope the new tyres will cure the wobble full stop wait and see I guess.