This is that same old discussion that always comes up about EQ: should you EQ to provide "better" FR to more seats, or EQ to fully optimize the FR at the primary LP? The two goals are essentially mutually exclusive, or, at least not accomplish-able simultaneously. Pick one... and accept what you get with the other.
In Mike's room, we picked the primary LP. Fortunately, it still sounded VERY good in the other LP.
I didn't even look further than the quoted post of ironhead's as that was what came up on screen when I looked at the thread, now I look further back and see what you're referring to with Mike's room. Only two LPs? I'll have to go and read some more....