Hi matressshopper123,
Thanks for the update.
While the most common cause for lower back pain is a mattress that is too soft … as you probably know there will be a break in and adjustment period with any new mattress (see post #3 here) and it’s not unusual to experience some “symptoms” during that time as your body gets used to a new sleeping surface that is different from what it’s used to so I would try and give any new mattress a month or so if possible (or at least a few weeks) until any “symptoms” have “stabilized” and are consistent before deciding deciding on any changes.
Phoenix