Have you tried a near-field setup? It may be your only choice in a room that size.
Set your listening chair in the middle of the room, or a little behind the mid point from the front wall. Then set up your speakers in an equilateral triangle from the listening position while keeping them at least one meter from the front wall. If my calculations are correct, you and your speakers will be about a meter apart. The speakers will be well away from the side walls and there'll be plenty of space behind your head. That should make your direct to reflected sound ratio better than 1:1. You'll be hearing the speakers more than the room.
Set your listening chair in the middle of the room, or a little behind the mid point from the front wall. Then set up your speakers in an equilateral triangle from the listening position while keeping them at least one meter from the front wall. If my calculations are correct, you and your speakers will be about a meter apart. The speakers will be well away from the side walls and there'll be plenty of space behind your head. That should make your direct to reflected sound ratio better than 1:1. You'll be hearing the speakers more than the room.