See my post down in "Do It Yourself" for the Dazus Keepers. Those o-rings I pictured there tighten those Dazus Fasteners right up, and kinda help dampen some vibrations.
Tried to post a link to it here but only succeeded in messing up that thread.
Use the blue loctite on those bracket bolts too...
Might check the rubber pads on the bottom of your bags...they do wear with the grit and grime of the road and the exhaust heat. If they contact the bar, they will make noise.
...and I used to think my Sportster was heavy...
A Harley will get you through times of no sex, better than sex will get through times of no Harley.
SE Heavy Breather
V&H Monster Ovals
SE Pro Super Tuner to make the above play nice together.