Rattling at Spring bolts

Just replaced exhaust from the spring bolts (including the gasket) down but having an issue at the connection. Because the welded nuts were corroded on the spring bolts I ground them down and used new nuts to lock in. I’ve tried several levels of tightening the new bolts but the rattle only gets worse.

Is my best/only option to cut the ends off and install a small flex pipe with clamps?

 

This post is impossible to answer. Seriously.

What gen? What year? What engine?

PICTURES PLEASE

 

Gen 2. 2006. V6 4.0
The nuts shredded where the red arrow is pointing so I ground them down to get a flatter surface for a new nut.
The only thing that seems odd is the new donut that came with the new exhaust is pretty small (fits) and doesn't give a lot of buffer between the two pipes.

 

The gasket that came with it is the thin one that came with the system https://www.summitracing.com/parts/wlk-39447
Would swapping that out with a more robust one with the mesh?