Well, you might scoot the speakers a little bit farther apart so that you're not quite so nearfield, and just for kicks try toeing them in severely so that they criss-cross in front of the listening position. If you want a warmer tonal balance, you might use even more toe-in or move the speakers closer to the wall behind them or move your listening position closer to the wall behind you (maybe shift everything to the right six inches if that big slanty edge intrudes). You might try removing the absorptive panels that are fairly far away from either the speakers or your listening position, like those ones to the far left; late arriving lateral reflections are often psychoacoustically pleasing.
These are little more than guesses, and even if they help in one area there may be undesirable trade-offs in another. But... they don't cost anything to try!
Duke
dealer/manufacturer