I also added the Givi bars (Givi TN3101) to my Glee that I rode earlier.
And vibrations came along with the bars, although I was unable to find the root cause for those vibs.
The appeared around 5000 to 5500 rpm, IIRC.
Sold the bike a while ago, but I keep reading from other Glee owners too about the vibrations introduced by the Givi bars.
The issue seems to be the connection between the two halves, the joint in front of the exhaust manifold from the front cylinder:
If I remember correctly, there were some rubber inserts, and those might have gone in the meantime. Check these, and/or try to get the connection between right and left bar as stiff as possible, by adding some shims or similar.