There is not much room to move them. A tighter grouping pulls them even more away from rear and side but puts them in my lap.
I will have to play with the crossover and gain of the woofer boxes perhaps.
Ok. Have you pushed them closer to the front wall to see?
Here is what I did. Take it as a learning exercise. I measured each speaker individually. First with it flush against the front wall. Then I moved it forward in 4-6 in increments and made the same measurements (15-400 Hz). I concentrated on the area from 100-400Hz as I knew SBIR would wreck havoc. I did the same thing with the speaker flush against the side wall. Repeated the same sets of measurements for the opposite speaker. Then measure them together. Hopefully, the distances of each speaker to their respective front and side walls are symmetrical but you might find that the overall 2ch response is better with one speaker 2 in closer to a boundary than the other, for example. After you find a spot where the midbass is as good as it can be (and your imaging/staging isn't compromised), you can optionally, start playing with 4 in and 6 in thick absorbers on the front and side wall immediately behind and around the speaker to improve the measured response. Even the floor! I draw a line from the seated listening position to the speaker and make sure at least my ceiling is treated over that line. My floor is carpeted, but you can lay treatments there too if you want!
Your deep but narrow dip at 80Hz is not really an issue as it is pretty much inaudible with music.
The area between 20-35 Hz that appears boosted may have to do with any LF boost in the Rythmik plate amp, but that's a plain guess on my part.
In addition, turning off the Rythmik sub section and making the above measurements can tell us which drivers occupy which frequency ranges. Then you can play with how the Rythmik's crossover to the main module but check with Salk on that first. The fact of the matter is that getting perfect bass in the same space where imaging/staging are important is extraordinarily difficult
. I've done it, but I did it in a way that you would find sac religious
And goosing up and playing with the EQ of the woofer boxes electronically is an absolute last resort. Unfortunately, many manufacturers use that as the first as most 2ch fellas are unwilling/unable to do what you have already done. That is, build an acoustically treated room
My comment earlier on 1/3 octave smoothing was rhetorical as there are probably a few newbies who are reading this thread. Still, 1/3 octave smoothing is nice to give you reassurance that "enough is enough."