I've heard and appreciated both the Be-10's and 20's but I'm not intimately familar with either so I can only speak theoretically. in my previous 2 rooms I owned the Aerial Acoustic Model 10T's 3-ways with 84db sensitivity, an 11-inch woofer crossing over to the midrange at 360Hz. And the bass when dialed into the room via optimal placement was spectacular to say the least and to this day I've not heard better. Now the 2nd room took me 9 months of moving the speakers an inch here or there several tims a week but eventually I got it. That was with 300wpc Class A/B and 160wpc Class D amps and the bass was even more musical with the 160wpc amps. I'm now in my 3rd room and with different speakers and with just slightly less musical bass. So I'd say at least theoretically the 11-inch woofer and 400Hz first crossover should be absolutely non-issues. Especially since the bass you're seeking to dial in generally resides well below 100Hz.
I saw your floor plan with speaker positions. Looks to be roughly 18ft wide x 22 ft deep x 8.5ft high and your speakers are roughly 4ft out from the front wall as well as roughly 4 ft out from the side walls. As far as I know the speakers should never be the same distance from front wall as they are from side walls.
Again, I'd like to suggest removing all treatments and absorbers from the room first. For all anybody knows, these items might make it more difficult to find an optimal placement for a very musical bass. Room treatments and accessories are supposedly intended to act as enhancements to what you already have. Since you're already lacking the musical bass, I don't see how these things can help get the absolute best speaker placement for best bass. And like I said earlier, once you've located an optimal speaker location, I'll bet dollars-to-donuts you'll also discover you don't need any of these acoustic treatments and you can sell or donate them.
I see you've got a doorway in the way of your left speaker so I'd suggest ignoring the door all together for a moment. For a starting point I'd like to suggest you bring the speakers a bit further out into the room from the front wall so that there's at least 5.5ft between the woofer's front center and the wall behind it (the front wall). Also, try moving your speakers about 1ft closer to the side walls so the woofer centers are roughly 3ft from the side walls. This is quite possibily as close to an ideal starting point as you may get. But it's just a starting point.
BTW, this level of musical bass, once achieved, will not be reproduceable on every recording you play. Of my music library, I'd guess maybe half of that will exhibit some form of musical bass. The point being that you've gotta have music you know will easily exhibit a musical bass when dialed in. Since not all recordings exhibit a visceral deep tight well-defined bass the same way, you'd totally be shooting in the dark without such music I've included 2 samples here exhibiting 2 different types of excellent bass and what the little recording mic doesn't pick up the visual effects will help demonstrate the bass. Also If you're unsure what music cuts will easily tell you when you've dialed in your speakers, there are many to suggest but I'd suggest the new 2018 soundtrack from A Star Is Born as it's wonderfully engineered and it has maybe 8 - 12 cuts with some excellent bass. Sure there's plenty of others but it's gotta be recordings you know will exhibit this type of bass when dialed in.
Anyway, from that initial starting point,
1. Listen to the same recording you know has or should have some excellent musical bass.
2. Use masking tape marking the speaker's positions on the floor in case you need to revert back.
3. Move both speakers in the same position back or forward or in oppisition to either left or right and only move in increments of no larger than 1-inch at a time.
4. If bass sounds worse, move them back to the masking taped positions and try another direction.
Rinse and repeat until satisfied.
If in the end the doorway is in the way of your left speaker's optimal positiion, well, once you hear the type of bass you may be seeking, perhaps you'll think it beneficial to have the doorway moved to maybe halfway down that same wall.
No doubt, there's several ways to approach your issue. This is typically how I would start and although many love to refer to "science", I find this effort to be far more art (or luck) than science. Also, in my own case, I'd given up a long time ago on locating the optimal placement positions for my VMPS RM-40 full-range speakers in this newer room. Even though I know the optimal location is there somewhere. Instead, I was able to achieve much the same musical bass I was seeking just by dialing in my 15-inch subwoofer. Funny enough, I'd never once moved my subwoofer from it's original position when I first purchased it 5 years ago. IOW, I was somehow able to accomplish this by fine-tuning the maybe 9 toggle switches and dials. No easy feat here either and this achievement was quite a suprise to me. Did I mention that truly musical bass is more art than science?
. DAC2X v2 should be here soon to replace the CDSAse. Next on the list is the streamer. I was wondering if streamers allow for some sort of room correction software. Maybe after measuring the response at the listening point, I can play 1-2 db on the troublesome frequencies to smooth things out.
