Hi clymb1,
Thanks for sharing the specs and it seems that you’ve been doing a great job tracking them down 
A few comments about the mattress …
There is the first “cool” layer that consists of 1" of gel infused foam 3.5lb-4lb: This is in the range of “medium” quality/density memory foam (which is about 4 lbs and up) but it’s also a very thin top layer that is more for surface feel and if a single layer on top of a mattress is in the range of about an inch or so or less then it wouldn’t have a significant effect on the durabiity of the mattress and I wouldn’t consider it to be a weak link
There is then the next 3 layers that consists of 3 layers of 5lb Visco foam: This is a high quality memory foam (5 lbs and up) and would be a durable material.
Then there is the 6" soy based core that I think rates @ just under 2 lbs with a 28ild: This is a polyfoam base layer and anything above about 1.8 lbs would be good quality. This would also not be a weak link in a mattress. the ILD is a comfort spec that rates the softness of the material and isn’t an important part of the quality of the materials (every type and quality of foam has firmer and softer versions)
Overall there are no obvious weak links in the mattress so if it matches your needs and preferences in terms of PPP (Posture and alignment, Pressure relief, and Personal preferences) and is also a good match for your personal value equation then it would certainly be worth serious consideration IMO.
I’m impressed that you (and your retailer) had the perseverance to make sure you had the information you need to make an informed buying decision.
Phoenix