Hi digitaldave11,
It’s sometimes surprising for “stomach sleepers” to find out how much time they spend in other positions.
There is more in post #2 here and the posts it links to about the different “symptoms” that people may experience and some of the underlying causes that can contribute to them and there is also more in post #2 hereabout the difference between pressure relief, primary support, and secondary support and the relationship between them. Both of these can help with the “detective work” that can be involved in deciding on which layers to change and how to change them.
While I can’t feel what you feel or see you on the mattress … based on the details of your mattress and on your feedback, If I had to guess I would say that changing the comfort layers to a softer version would probably have “more” effect in your case and have a higher chance of success than changing the deeper support layers although both would have “some” effect.
Phoenix