Let's see if I picture this correctly.
Studio apartment. Cannot place them closer to the front wall. Maybe could place them 2-3 feet closer to the front wall. Would like to keep aesthetically pleasing and utilitarian...
I picture the "front wall" as being the kitchen/dining area? Is room rearrangement possible?
I had a studio apartment about 20x35 feet. Entry, kitchen/dining, living area, sliding door, lanai, then10 story down. My placement was reverse of yours. My front wall was the sliding door. My back was the kitchen/dining area.
1- You are near field listening anyway, turn everything 90 degrees. Use those walls.
2-Reverse like I had. Have the kitchen behind you.
If rearrangement cannot be possible, maybe something like of a reflective room divider 2-3 feet behind your speakers. Haaa, Just for picture imagery. A pair of Magnepans. Or two.