Hi Aradialv,
I’m glad that the information I offered was helpful. It is common that people confuse “firm support” with a “hard mattress”, but in truth you want to differentiate deep support from your surface comfort/surface support. There is also more about primary or “deep” support and secondary or “surface” support and their relationship to firmness and pressure relief and the “roles” of different layers in a mattress in post #2 here and in post #4 here that may also be helpful in clarifying the difference between “support” and “pressure relief” and “feel”.
One final comment is that “pressure issues” are often what you feel when you are going to sleep at night, but “alignment issues” are normally what you feel when you wake up in the morning either with or without back pain or muscle stiffness and soreness. But I know in your situation these generalizations may not apply.
Phoenix