Going by the room dimension the width looks good and the ratios are not bad -
2.3 : 1.8 : 1 (2 : 1.5 : 1 evenly spaced room modes).
You have some distance from the side wall to work with.
Pick up 4 - 6 freestanding absorber panels to start - this should give you a good place to start.
Is the 20-30 inch limit going to the front of the speaker?
Also Wilson allows for some adjustment of the ports ...