@tomcarr - I already have these treatments:
GIK Tri Traps 2 pairs stacked in front corners up to ceiling
https://systems.audiogon.com/systems/3600#&gid=1&pid=7
GIK 244 Bass Traps at 1st & 2nd sidewall reflections
GIK Evolution PlyFusors (3) on back wall
https://systems.audiogon.com/systems/3600#&gid=1&pid=8
What else might you recommend?
GIK Tri Traps 2 pairs stacked in front corners up to ceiling
https://systems.audiogon.com/systems/3600#&gid=1&pid=7
GIK 244 Bass Traps at 1st & 2nd sidewall reflections
GIK Evolution PlyFusors (3) on back wall
https://systems.audiogon.com/systems/3600#&gid=1&pid=8
What else might you recommend?