Hi cprice88,
I split your post into a new topic so that two sets of questions that may have different solutions don’t get mixed in together and to help me keep track of each one better.
I think that your issues may be different from cvincent’s because your mattress layering is much softer which would be more likely to cause “roll together” in the middle of the mattress if you sleep close together. A mattress that is too soft is also the most likely (although not the only) cause of lower back pain as well
You are also in the early stages of the break in and adjustment period so if it’s possible I would wait for a few weeks before deciding on any changes in your layers but if anything I would guess that the odds are higher that your mattress is too soft than too firm (possibly on both sides).
There are also some suggestions in post #2 here that may be helpful as well (especially about any mattress protector you are using or the support system you have under your mattress).
If it does turn out that you need softer top layers than SleepEZ normally provides (possibly with firmer middle and bottom layers) then you can always add a softer topper.
Phoenix