Hi silphium,
I would also suggest giving any new mattress some time (at least two weeks if possible) for the mattress to break in and also because there will be adjustment period for any new mattress … especially if you aren’t used to sleeping on latex which is much more “supportive” and resilient than other types of foam (see post #2 here).
If you have been sleeping on a mattress that allows your spine to sag and your muscles are used to this then it can also take some time for your muscle memory to change and for your body to “relearn” to sleep in a more natural alignment (see post #7 here).
If you have given things enough time and it becomes clear that you need to make some changes then post #2 here and the posts it links to has more about some of the more common “symptoms” that people may experience that can help with the detective work that may be necessary to decide on the types of changes that would move you in the direction that works well for you. If you do begin to rearrange layers or exchange them then I would take a very systematic and incremental “step by step” approach (making sure that you spend at least a few days on each new combination so that you can identify “patterns” in your sleeping experience) so that what you “learn” from how your “symptoms” change each time you change your layering can be used as reference point that “points to” the next combination that has the best chance of success.
Phoenix