I would absolutely not attempt speaker changes for this. Those are fabulous speakers, but maybe a second sub.
The very first place to start is room acoustics:
ATS Acoustics
GIK Acoustics
Wall panels will reduce mid/treble hash and output, and improve clarity. Bass traps will make room correction work better.
Regardless, seal the main ports and re-run the room calibration. You are allowed to raise the bass level by the way, if you don't like the end result. This will reduce amplifier strain, Doppler distortion and driver excursion.
After you have done the room calibration, a second sub could be really good if you have flexibility in placement. If you want to simulate this, try Room EQ Wizard's room simulator.
The very first place to start is room acoustics:
ATS Acoustics
GIK Acoustics
Wall panels will reduce mid/treble hash and output, and improve clarity. Bass traps will make room correction work better.
Regardless, seal the main ports and re-run the room calibration. You are allowed to raise the bass level by the way, if you don't like the end result. This will reduce amplifier strain, Doppler distortion and driver excursion.
After you have done the room calibration, a second sub could be really good if you have flexibility in placement. If you want to simulate this, try Room EQ Wizard's room simulator.