Thanks, both of you for your suggestions.
Both of your notes are the main reason I've not tried really tried anything until now. It's a frickin' lotta' work and as John said, it is the most difficult thing to achieve. And like John said, it just may not be possible in this room config. that I've had for 7 years now.
The frustrating part is having heard at some point in time past a bass that is so tight, well-defined, and musical that if/when that "perfect" location can be found, it's worth whatever time it took to get to that level. But again, so frustrating in that the infinite amount of variable / possible locations and it may never be found and/or may not exist.
The bass has been so "satisfactory" in their original positions that I've not spent any real time pinching putty. I lost the original compound strip the seller provided but a few weeks ago, I purchased some Mortite. I cut about a 1" square piece x 0.25" thick and stuck that to the passive drivers. It seemed to thicken the bass just a tad and maybe gain 1Hz. Considering the small pinch recommendations, it did not have nearly the effect I thought it would so I removed the newly installed Mortite.
Last week was my first attempt at moving the speakers. Originally, the woofer fronts were nearly 7.5ft out from the back, er, front wall but are now 6.5 ft out. No real difference in bass, just a slightly more uniform soundstage presentation.
I've deliberately left the speakers toed in to only about 5 degrees because the RM40's can easily become overly bright if one is not careful. I've got the treble and mid-range adjusting screws set at about 11:30 right now. If I toe them in more direct to the chair, which I've tried, they become borderline overly bright.
I've tried opening both pocket doors behind the chair but I was unable to notice any difference. Thank goodness, because I have family members and 2 cats.
So many options and variable and so much weight at 240 lbs. per side.
I do have a Radio Shack SPL meter but lack knowledge and experience how to use it in this regard. And I'm unfamiliar with any software. But I'm open to your suggestions.
In time past, (different room and speakers) I found that roughly 5.5ft out from the front wall and 2.5 ft from side walls worked quite well as a starting point. So maybe that's the next step. But the soundstage depth has already collapsed a bit going from 7.5ft to 6.5ft.
Tell me this. Do either of you believe that most room / speaker combos have a near perfect or most optimal speaker position somewhere/anywhere and it's just a matter of finding it 1-inch at a time?
Or do you believe that for some slightly unreasonable rooms (like mine perhaps) certain room measurements simply prohibit any opportunity to locate that magical synergistic spot?
I'm not trying to be lazy about this. Rather, I'm simply trying to be realistic that in my pursuit to find a pot of gold at the end of the rainbow, I may instead discover I've been chasing windmills. As John implied.
Anyway, thank you both for your input.