Hi aredman71,
Both Rocky Mountain Mattress and Select Foam use foams that are manufactured by North American foam manufacturers that are CertiPur certified even though they themselves aren’t (see the guidelines here).
Nobody else can feel what you feel and there are too many unknowns, variables, and personal preferences involved for anyone to use specs (either yours or a mattress) or "theory at a distance to predict which mattress would be the best match for someone else in terms of PPP (Posture and alignment, Pressure relief, and Personal preferences). When you can’t test a mattress in person then the best approach would be a more detailed phone conversation with a knowledgeable and experienced online manufacturer who can help “talk you through” the options they have that have the best chance of success for you and who will know more about their own mattresses and “matching” their mattresses to different body types and sleeping positions based on the “averages” of their customers than anyone else (see mattress firmness/comfort levels in post #2 here).
Phoenix