You might want to experiment with moving those REL subs out of the corners. They are so good that, in my experience, corner loading is not universally the best placement.
Since you are going to employ REW, you should be able to see what works best with some placement and measurement experimenting. I suspect that you also have room nodes to deal with in the corners near the floor. But, you are taking a pretty sophisticated approach, so I am sure you will end up optimizing your set up as best as you can. Have fun, and thanks for the reply.
FWIW, I have a single sub set up in my big rig at home (huge, “vintage” SVS ultra plus/2) and my office system (REL T/5i). In both instance, after experimenting with different placements, I have settled on placing the subs slightly out from the right wall about 1/3 in to the room from the front wall. With the REL, in particular, I just could not tame it with corner loading. Now it just disappears. I don’t have any corner traps (yet) so that might partly explain where I ended up.