Hi gibo,
The first thing I would suggest is to give it some time (preferably a month or so but at least two weeks) so your mattress can break in a little and to give your body a chance to adjust to a new sleeping surface (see post #3 here).
There are also some suggestions in post #2 here that may be helpful (such as checking your foundation, your pillows, or the mattress protector or any mattress pad you are using on your mattress).
If you still aren’t sleeping well on the mattress after that then you may need to rearrange your layers or exchange a layer for another one that is either softer or firmer.
If you aren’t sure what changes to make then (keep in mind that nobody else can feel what you feel on a mattress) then post #2 here has more about the most common symptoms that people might experience on a mattress and some of the possible causes for them and it would also be a good idea to talk with Clean Bedroom so they can help talk you through the type of changes that may be helpful in more detail.
If you still aren’t certain what to change then some trial and error may be necessary so you can make your mattress either firmer or softer in various ways (either firmer/softer support or transition layers or a firmer/softer top layer) to see which one helps you the most based on your actual sleeping experience. If you decide to make some changes to your mattress I would make them slowly and incrementally and make careful comparisons between each configuration and the last one about how your experience and symptoms changes with each one so you can use changes in your “symptoms” between each combination as a pointer to the layer combination that will work best for you.
Your mattress is “in the range” of the layering that most people would do well with in your weight range but each person is unique and not all people fit the averages.
Phoenix