Over damped Room?

I recently moved into a smaller listening room (10' by 13') and had floor stander that had to go from old house...I ended up with some atc scm19 v2 and thought I was done with room treatments...lately I have been turning system up...way up to get some grunt/dynamics going...having 200 watts... today I removed the rear bass traps and man my speakers can breath again...

I was all set to get new subwoofer and cables...couldn't for the life of me figure what was missing...

Micro details,air more low end...Definitely worth trying.