I have a Burgman 650 with the Bestem top case on the back. I love the case but all it does is rattle and shake. The mount is secure. My friend was riding behind me yesterday, and he said he was waiting for it to bounce off. I am about ready to bolt it directly to the mounting bracket as I never remove it anyhow, but before I do that I wanted to see if you all had any tricks to stop the rattling and bouncing...