To answer your dilemma, you set your speakers, treat room, then tweak your positions if need be. It's really not as hyper dynamic as it seems. The speaker response direct/off axis doesn't change, just reflections. Since your mains are omni directional I'm not sure treating the front wall is a good idea with anything but diffusion (if at all.) I have seen pics of a few dipole setups with large diffusers on the front wall but I'm not sure if it was done as a matter of performance rather than indulgence.
Alan would be best to comment on what to do there.
