Heat Shield Rattle, What have you tried?

[Reloadit]

My shields rattle like crazy in the hottest months, almost nothing in the winter.  I have quieted them down lately by stuffing wood stove gasket fiber here and there, but I'm wondering if I squeezed a bunch of high heat gasket pookie doo in the right areas, if it might give me a little better peace and quiet?  

Looking for some opinions on this.  I don't know if the rattle is the shields hitting the exhaust or just the shields hitting shields.  Before I go making a mess, thought I would get some opinions here.

Obviously they expand when hot so I can't expect the goo to remain adhered on two surfaces but maybe it would still maintain a buffer from metal hitting metal?  Thoughts?