Hah, can certainly relate to that.
Yes, RTA mode would be fine.
Yes, DSP is very handy for time domain.
Any EQ, digital or not, must be applied judiciously. With a non-coincident design, especially so. Remember, EQ applies axially to one point in space. We have two ears..and HRTF. Big problem.
I understand Acourate goes beyond that, but EQ cannot correct globally, the polar response of the speaker must be smooth natively. It would be interesting to see what is happening globally as you eq to your LP. Gated NF response of the system in a 60 degree window, with the Acourate EQ applied, would be interesting.
Luckily, in your case (at least horizontally) the Revel should be very good here. i.e., the off axis will track the on.
If the "JJ" you refer to in the other thread is who I think it is, you've struck gold. Read very carefully what he has to say. Especially about EQ above 500hz.
No doubt your getting excellent sound, you're starting with excellent sources. How is the inter-channel consistency (REW measured?) with the Acourate?