IF the issue is bass, then closer to walls and corners will help.
The dilemma of course is always that closer to walls and/or corners will also likely have a negative effect on soundstage and imaging, especially soundstage depth. If that can’t be worked out to satisfaction then subs are the solution.
Also have not researched these speakers and amp specifically, but an impedance mismatch from amp to speakers can also play into otherwise good sounding speakers not sounding good, especially smaller more bass extended ones. I’d check that out as well. My recollection is ref3m are not as efficient always as specs may indicate and more importantly they may not be an easy load to drive which is typically the case with smaller speakers designed for maximum bass extension.
Also always avoid early reflections for best soundstage and imaging.
That should cover it.