I've added all the upgrades you've described over the past three years to my RM40's except the outboard cross over. In my opinion this is the order of what makes the best improvement: 1) mid woofer upgrade, 2) CDWG, 3) blackhole, 4) lambswool. I'm not sure I could hear a difference with the lambswool, but it was cheap enough, thus worth doing. The mid woofer upgrade and blackhole upgrades are significant, especially if you like music with deep tight bass.
Corbin
I think Corbin "nails" it pretty well.
I do want to remind all that the initial cabinet upgrade offer has been over for some time (actually over a year) and getting new cabinets is a larger undertaking.
That said, I would seriously encourage those who use VMPS for both HT and 2 channel, to consider the value of "splitting" the RM40 pair, picking up the CDWG's, and using the pair with one in the FRONT, (horizontally) for a CENTER Speaker, and one in the rear for the rear of a 6.1.
Then pick up a pair of RM v60's, RM30C's, or RM2's for the L&R.

This will work well with Front and Rear Projection Systems, and talk about a sweet spot for HT aa
And the Dynamics would be majestic and bordering on unbelievable.

There is
"NO" Center channel that I have ever heard that could compete with this on all levels (Yes, you run it on LARGE)