Sounds like a great plan; I guess I neglected to think that the problem may be room related and jumped to a mic related issue. I've been on the lookout for a good equalizer on CL for a while now and haven't been able to find one so far, but I'll keep looking. I do have access to the 9-band eq on the Mackie mixer amp that we use as a power amp (http://www.mackie.com/products/808s/index.html) but I haven't tried to use it after reading on here how useless they are. I usually plug into the direct power amp inputs which bypasses all of the controls on the unit. If you think it might help I can try to use that.
Probably not worth messing with a 9-band EQ.
When you have a system of chained components interacting together in a particular environment, it's hardly ever just one thing. Everything should be balanced or find equilibrium.
If you want a GEQ which will interface well with your Mackie powered unit I have a Rane GE27 which will fill the bill nicely. I've been looking for a new home for little GErry for a while. Sounds like you could provide that.