I use the ECM8000s for drum overheads while cutting live bands all in one room. I set the drums up at one end of the 30' long tracking room so they project out of a corner. Then I set the amps along the long wall facing the same direction the drums project towards. The amps are baffled off with office dividers, usually one on either side of each amp, with a third forming a roof over the bass rig. I leave the fronts open so the players can stand out in the room while hearing their direct sound, and guitar players can move into their "cubicle" for feedback. This keeps the amp mics from bleeding into eachother and beams the speaker's throw into a fairly narrow controlled path. The long wall everything points at is faced with fiberglass and covered in burlap so there's very little bounce off of it. You can do all this with some sawhorses, blankets, and 4x8 pieces of sheetrock-plywood-whatever.
In the end, the drummer has to rely on phones to hear the amps, but everybody else can position themselves to hear what they want live. The bassist always seems to end up on a stool at the mouth of his bass "hut", go figure. When I switched from the cardioid SM81s to the omni ECM8000s, it just sounded better, with no new bleed problems. HTH