Cmpsr - Whatever works for you, you can only use what you have, same with me - I've got an upgrade list that's pretty long !
Here's a possible idea. Most music stores have a 30-day return policy in the States here, some mailing order stores do also. Take $200 and buy
a behringer DEQ2496 or some other good sounding RTA/Parametric. Dbx has one too, driverack or studiorack - something like that. If that doesn't help exchange the EQ for your monitor upgrade within the month!
Anyway, if you use a para - with the behringer you can set octave widths of 1/10 down to 1/60 if you wanted to experiment with trying to get a better tool around a 'room mode' peak and push it down a bit. You'd have to fight with it less though if you creatively re-arranged your room to get out of the corner and into the room - I've tried that and it works.
I guess you could also try to build a couple of bass traps and stick one in the corner and one next to the other speaker if you're going to stay there - I haven't tried bass traps yet. Some folks say broadband, other folks say tune a tube trap. It depends and it can take a combination of things is my conclusion. The problem with speakers next to walls is that the bass (< 300Hz) wraps around behind the enclosure, bounces off the nearest barrier (the wall), and travels back out to slam you in the face - a bit out of phase so your ear may be in a peak or valley. You know that it sounds like.
What type RTA do you have ? If it's 1/3 octave you can get better resolution by recording into your computer and use the free Inspector (Elemental audio - VST) to 'see' the bass peaks while you move the mic (your ears) around at the 2' listening position. That's where the sound has to get to anyway. The 1/3 and 1/6 octave analyzers can sometimes average out certain peaks and valleys - I've seen that already.
Keep us posted - I'm picking up tips too ! Sounds fun - oh, yeah same fun I'm having ! I'm not going fo flat, I don't have that much 'control' - just something that translates well.
kylen