My rattles in the rear came back very intermittently after my first fix, so I knew I had found the culprit, but clearly hadn't done a good enough job, so I went back and redid it. I put much more thick velcro tape in the area this time. Felt side only.
The doors don't click into place, I just let them rest on the felt.
They don't move at all now and there is 0 buzzing now during my extremely loud cold starts (dp+exhaust)
Happy that it was a simple fix. Those deck lid clasps sure do like to chatter.