That's a pretty small room, and you're likely to have a lot of room modes, which moving your speakers about is slightly alleviating. I'd read the info (and use the calculator) on http://www.realtraps.com/modecalc.htm and http://www.atsacoustics.com etc and if you are open to it consider buying 100ukp of fibreglass / rockwool and play around with what makes your room sound better. Or put that 100 into a mic+preamp and download the free REW tool and really measure what's going on smile

Living room: DSP5000.3
WFH Office: M33
Bedroom: P200ZQ