I read through it. Did you get your's solved? Haven't heard back from the dealer yet, but want to make sure they've checked for possible causes.
Yes,.. mine was a tyre issue. the tyre that was install was the wrong LOAD rated for the weight for the bike. It had been over looked by the shops I had gone to. I found it just by fluke when I was reading the info on the left side wall of the tyre. It would be fine at speeds under 68 mph over the top of that it would become (in my opinion) unstable and the bike would begin too wobble.
You said you put on new tyres maybe worth a check.
I'm still in the proses of trying to get my tyre chanced at no cost. I'm still waiting on their reply.
I should add how I determined it was the tyre,.. I put 43 psi in and hit the road for a test run (btw rear tyre) I got her up to 86/7 mph completely in control and smooth run. What ever The extra 3+ psi did it stabled the tyre and cleared the wobble but it's over pressure now and that was when it was cold. I don't know what it climes to when hot