Consider re-thinking the current placement that is so close to the sidewalls.

You might be better off with one speaker in the corner on a little stand on top of the subwoofer, and the other speaker on the right top of the piece of furniture that holds your receiver. Or put *both* speakers on that piece of furniture, with one on the left edge and one on the right. They'll be too close together, but that's probably better than now - too far apart and too close to the sidewalls.

If you must leave them where they are now, then toe them in considerably, pointing toward the center of the room. And then consider getting a center channel speaker, which is a must if movie/TV watching is involved and your L/R speakers are so far apart.