Cool, Darryl; I should make MORE people do the stuff I do for them, oughta be worth at least a couple "attaboys"
One thing that would make your layout easier to work with is to use only red lines for nulls, and only blue lines for peaks, and make ALL lines thinner - it's hard to be sure, but looks like your speakers are in 4th order null for right channel and close to 4th order null, 3rd order peak for the left channel, and real close to 4th order null on the left channel.
Unfortunately, in that small a room it only takes an inch or two to make a noticeable difference, so making things as dead as you can was the right move so far.
One thing that might help is a sub; if you put it in your CHAIR (raised up as close to ear height as possible) then crawl around the floor til you get the strongest/evenest bass, that spot will be the best place for the sub; at least that might bring down your bass in mixes.
Another possibility; pull both speakers away from the wall just enough to put 4" 703 or rockwool spaced out from the wall by about 4", this would not only push your entire mix area closer to the door and your head further from the dead center of the room, more into that GREEN area - it would also smooth out the SBIR you're likely getting from the two walls behind the speakers.
Sooo, do you step into that room to ditch your glasses and peel off your shirt, exposing your "big red S"??
I've STILL not learned to "sleep-type", although some would argue...