Choice of insulation & fabric for diy panels?

[spaceape]

Hi all. I hope that you're having as much fun with your home theaters as i am.

I have a few concerns that i need to have answered.

1. In my home theater i've added no corner traps or the like because of limited space. Instead i've added high density insulation slabs in all of my panels. Will this be a decent compensation or do very little too help with lower frequencies absorption since most of those frequencies tend to gather in and around corners?

2. For all of my panels i've used microsuede fabric which haven't got very good absorption for the very high frequencies. Im mostly concerned that this combined with the rather high (100kg/m3) density of the rockwool will result in bad performance for my 2" panels. That being said i have quite a lot of them so maybe it ain't too bad. Is this something i need too be concerned about?

This is an illustration of my room. The main ht is in the left half part of the picture. My couch is in the top left of the black rectangle and the speakers and screens are on the opposing wall. Take a look in my gallery to get a better idea of the room.