Viewing your virtual system, it is so much easier to offer advice,
my comments are based on concentrating initial soundwaves, controlling/eliminating too soon reflections, for two reasons: the purer imaging you will experience, and once rear sound waves minimized: move the TT into the top of the stand in the recess behind/between the speakers, away from it’s current side position. Perhaps also cover the recess surfaces with absorbent material, or a sliding curtain/panel to cover the recess during play.
My advice is to consider changing your speakers, getting rid of the rear ports and then: what makes enough bass that you would not need subwoofers?
If subwoofers, I would recommend front firing, not bottom firing, a stereo pair as you have now, as any mono note’s overtones become directional rather quickly, giving imaging clues to the origin of the fundamentals.
I love JSE Model II’s, and for your space their smaller Model 1’s would sound terrific, I helped my friend with his in a NYC Apt, and my son has a pair, they include both of Richard Modafferi’s patents.
JSE Infinite Slope Model 1 Review
Here’s two pairs, 1 black, 1 wood veneer, both would need replacement tweeters (easy), new grill cloth (easy). Either local pickup you would pay UPS Pack and Ship yourself, just have seller drop them off unpackaged/
After you fall in love with them, change them to 3 wheels, not 4, (anti-tip rear corner blocks) have a woodworker cover them in a beautiful veneer or ...... they would look as good as they sound.
add it all up, still not a lot of money and good luck equalling their amazing sound, the Infinite Slope Crossover is amazing.
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Joseph Audio still uses Modafferi's Infinite Slope Crossover