Can you post more details about your room, like present placement of speakers, listening position, doors, windows etc and also what the height of the room..
Before you go any further, the first thing i would suggest is to add a exhaust fan - maybe one with a duct. Windowless rooms become moist and humid and results in growth of mold. You need a ventilation system. This will become apparent after you do the acoustic treatment as mold can settle on the panels, carpets etc.
Also, you seem to have a nice setup - pls do post on the forum often.