Thanks for the response franman.
I have 2 sets of free standing monitors with sub 4ft from the front wall.
So the correct thing to do is install panels between the front wall and monitor to complete a reflection free zone at the front half of the room (what I have for now is, corners, ceiling, sides, all with 4" of 703 installed off the walls and ceiling).
The distance from the monitors to mix position is 4ft, I do walk around quite a bit when I get the balances close.
The distance from the monitors to the back wall and back to the mix position is 32ft.
Any insight/direction of proper treatment for the back wall of my room would be greatly appreciated.
Mike