Hi SaintLouisSleeper,
I switched your post to a new topic of its own.
While it’s not possible to “diagnose” mattress comfort issues on a forum with any certainty because there are too many unique unknowns and variables involved that can affect how each person sleeps on a mattress in terms of PPP or any “symptoms” they experience … there is more about the most common symptoms that people may experience when they sleep on a mattress and the most likely (although not the only) reasons for them in post #2 here.
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”.
These posts are the “tools” that can help with the analysis, detective work, or trial and error that may be necessary to help you learn your body’s language and “translate” what your body is trying to tell you so you can identify the types of changes that have the best chance of reducing or eliminating any “symptoms” you are experiencing (at least to the degree that any symptoms are from your mattress rather than the result of any pre-existing issues you may have that aren’t connected to a mattress).
Overall (and not surprisingly since he is an expert in these types of issues) I would agree that Jeff’s suggestions would be the first place I would start to see if they can help solve the issues and “symptoms” you are experiencing.
While your own personal experience is really the only way to know whether an extra layer will be helpful … there is more about the effect of thickness in post #14 here. “In theory” it could be helpful but I would try some of Jeff’s suggestions first.
Various zoning systems can also be very useful and worth considering for people who have more challenging circumstances or sensitivities, body types that are more difficult to “match” to a mattress, or who have a history of having more difficulty in finding a mattress that works well for them. There is more about zoning in this article and in post #11 here.
Phoenix