Massive amounts of dust.
Even with all that muffling I'm still getting goofy triggering at times so I'm gonna just admit defeat and get a mesh head.  lol
I tried with no muffling and it's a clusterfuck of double triggering.  Even with all that pressed against the head it still does it.  I had the same issues with the toms when I tried to use real heads.  The problem went away when I switched to mesh.
Wich is ok with me since mesh is a lot quieter than plastic.  haha
But everything sans the kick triggers great.
Oh yeah and that is dust.  This is my basement so...