I'd be a bit concerned about that as its not something I get unless its wind induced. You're not gripping the bars too tightly are you?

I get get a bit of a wobble on mine at 85 on a banked sliproad when it goes downhill but other than that its pretty good if not entirely stable at speed (but that's down to the suspension I believe)

Also the Ten vibrates a lot more when cold, I find it takes a good 5+ miles for it to settle down properly, particuarly on a cold morning like we're starting to get.