room tuning 12ftx12ft room

hello, my first post. i have a very small room, 12ftx 12ft. i have the speakers where i think they sound pretty good except for some boomieness in some bass areas and even cut-out of bass or maybe room overload when i start to turn it up a bit. but anyway, i have 4 2"x4ftx2ft framed insulation panels behind the speakers, 1 on each side of the speakers (using the mirror trick) and 2 directly behind me, with maybe a 2" gap between them.

i've thought of covering the wall behind the speakers completely floor to ceiling and coming out on the side walls 4ft floor to ceiling. then just leaving the two panels directly behind me. does that seem like a good idea?

thanks