Sorry can't help as I have same problem. I used BT056, at around 6K I felt vibration, so I changed tires (were due anyway) to BT016 full set. Still at 6K+ till 7.2 I can feel it.
Tires are new, balanced and all. Really don't know. Maybe I must get use to it. I was thinking of chain and both sprockets - what do you guys think?