Nice rig! You don't say how far apart the speakers are, but I suggest you start with moving the speakers further away from the back wall, maybe go to 2 feet. That should bring the bottom end more in-line. Double-check the mid and high range adjustments on the back of the speaker modules to make sure they are flat. You already have some notable toe-in, but you will have to fool around with that quite a bit to get the most out of the room. You may find the sloping ceiling is accentuating brightness the closer you get to your sitting position. That could mean you have to move the speakers closer together and sit closer, or perhaps throw a rug in front of the speakers. I've always started with the inside taper of the woofer and midrange cones pointing at my ears and adjusted from there. I prefer to use a mono recording I know well and listen for vertical coherence as an indication that I'm on the right track. Figuring this stuff out is half the fun, so take your time and happy listening!
Placing B&W 801s3 in Small Thin Room
Always wanted the 801's, and now, when retired and in small house I finally get some Series3, but my room is not ideal This is my room. The speakers are on the long wall which is 27' and has a vaulted ceiling directing the sound forward and down. So far so good. The bad is the room is only 15' wide. Right now I have the speakers (both base and swivel mid/high) facing forward about 1' from back wall with listening position chair up against facing wall. There is an archway that cuts out some of the listening wall and several alcoves that can be used to mix up reflections. I have expected seting the woofers at 30deg to back wall would reduce boom but it did not. Base is too strong and little slow, while top end is bright. Being driven my Krell KAV250p and KSA250.