Lower the side and rear surrounds for sure (even if you don't go monopole, which ideally you would), add some on-wall M3s mounted on your ceiling. That is what I did because I too soundproofed my room and wasn't about to punch holes into the ceiling in hopes of retrofitting something. I am using a combination of Axiom Full Metal Brackets for the front two, and a simple wooden "wedge" for the rear two overheads. Yes, I had to remove the main drivers and drill holes into the backs of the rear overhead M3s to mount them to the wooden wedges, but some precision holes, some t-nuts into the wedges, and some bolts for a clean fit.
Works really well and allows for aiming of the whole speaker and not just the tweeter.
