There are 3 immediate problems I see: 1) the room is too small to allow a dipole to work properly. 12 x 18 would be more like it. 2) the acoustical panels would be of more help on the sidewalls helping to scatter and diminish the first reflections, effectively helping the room sound bigger. 3) the dimensions are nearly cubical, causing a cluster of eigentone resonances in the 100-120 Hz range.
For speakers, the Monitor Audio Silver 300 7G works well with the face only 24-30" from the back wall and 18-24" from the sidewalls. With dual 6" woofers and dual rear-facing ports, bass tuning is easily matched to your taste and the room. While the Soundstage will never be as big as a Maggie, you'll never get that with Maggie's in a small room anyway. But the midrange clarity and dynamics of the MAs will capture your attention every time. Anything with larger 8" woofers will likely overload the room. Other high quality brands with similar configuration 2X6" woofers, stuffable ports will yield similar results, only with their own 'flavor' e.g. B&W, Focal, Dynaudio, to name three.
I'd also consider a few more acoustical panels. The short critical distance in a small room means the reverberant field overwhelms the direct sound very early. More acoustical treatment will help mitigate that.
Once you've addressed the the big acoustical issues, then if you wish to pursue tweaks, you'll have an environment where you might actually be able to hear minor improvements.
Finally, different mixes of the same song from different platforms can and do sound dramatically different. Some will favor your rig, and some won't.