Problem seems to affect the AL2 onwards (Glee).
If you have vibration issues at 4700 RPM ring Suzuki customer services and complain. The bars are unfit for purpose if you are suffering to live with them (and obviously flawed in their design as they have been withdrawn from sale, would this be the same issue we have been harping on about for the past 2 years perhaps??). They told me to take them off , I suggested they were there for a purpose to protect the bike. Whilst they will not refund you or replace them you might be able to get something for your troubles. I did.