When you fitted it to your bow did it come with a thin piece of rubber backing for in between the sight block and riser ?
If not then a sliver of old bicycle inner tube is surprisingly effective at reducing shock/vibration loosening sight adjustment screws.
Always worth getting a second set of eyes to check the bow over to see what is causing the vibration in the first place as a well tuned & set up bow won't normally vibrate very badly during a shot cycle.
Karl