To directly answer your question, I was lucky enough to hear the Salk speakers in an audio show in the SF Bay Area. That also allowed me to meet Jim and listen to him talk about his speakers and his goals. A class act! Both Jim and his speakers.
My first Salks were the HT2-TLs, prior to Jim moving to the RAAL tweeter. They were fantastic and served me well for several years. After hearing the SoundScapes (?) at another audio show, my wife and I decided to pony up and get the SS10s. A noticeable step up from the HT2-TLs. I also have a pair of the old Salk Ellis speakers and a pair of the HT-1s.
That brings me to the next consideration. In the old days, Jim used the Seas mid-range drivers in most of his speakers. Now he has a veritable plethora of speaker designs. There is no "Salk" signature sound now. If you go to someone's house and listen to a Veracity series speaker, that will not tell you much about a SoundScape speaker that uses different drivers (except the RAAL tweeter). To complicate things further, Jim is willing to work with you on custom designs, using the drivers of your choice. Maybe no one has heard a combination you come up with.
The other thing I would throw out there is the bass loading style of each the speakers. I found the transmission line (TL) style cabinets to produce a a type of bass that requires more room adjustments to smooth out. That is one of the nice things about the Soundscape design. You end up with 6 drivers producing the bass which greatly smooths out the room response.
One other consideration is the efficiency of the speaker designs. The SoundScapes and HT-3s can be difficult to drive to loud volumes, if that is what you are into. My guess is that your Bryston could probably handle any of the Salk designs?
It looks like you have a fantastic room for audio and it would be interesting to hear what you hope to gain by moving from your current speakers to the Salks.
I will say that I have tried a lot of experimentation with my audio setups and I tried something like you have done with the separate subwoofers. I could never get that to work nearly as good as the Soundscapes.
If you have never been to an audio show, give it a go. It is a lot of fun!
Lake Hotel, Yellowstone NP