Hi Rachierad,
It may be worth reading a few posts including the first part of post #2 here as well as post #2 here and post #6 here to give you some insights into the effect of different changes.
It’s very important to make sure you have identified the most likely reasons for any “symptoms” you are experiencing before you make any changes so that you don’t make one symptom better and another one worse.
Because your transition (middle) and deep support layers are softer than the norm … there is a possibility that your symptoms have different causes. Your back issues could be coming from the softness of the deeper layers which may be allowing your pelvic girdle to sink in too far (in spite of what it feels like to you) which would tilt the pelvis and could put the spine out of its neutral alignment. It would also allow you to sink in deeper which means that your lumbar curve would also have firmer contact with the mattress and could be creating a feeling of “pushing back” there more than you are used to. In addition to this … when you are sleeping on your side on a mattress that is too soft for your body type then you could also be overextending the hip joint which could cause symptoms there that weren’t actually pressure issues but joint alignment issues.
I would check your alignment very carefully on the mattress before making any exchanges and I would also make sure that you talked with them as well about the changes you are proposing which would make the support layers even softer than they are already are which could be “risky”.
It may also be worth re-arranging some layers for a few nights to see if any differences in your experience help point to the most likely causes of your “symptoms”.
The possibilities here would include using the 28 on the bottom and the 32 in the middle which would firm up the support under the comfort layers slightly (and slightly firm up the comfort layers as well) or putting the 2" layer on the bottom (temporarily) and the 32 in the middle and the 28 on top which would also firm up the comfort layers but would “allow” your hips/pelvis to sink down even less as well. Any changes in your symptoms these combinations produced (regardless of whether they solved them or not its how the “symptoms” change that is important) could provide some helpful insights.
Phoenix