Hi jet7571,
I think you may be losing an opportunity to help you understand why you are having some of the issues you are having. Regardless of whether the mattress you have in some combination of layering ends up being the ideal for you … I think that the more “random” approach you are taking or considering may not help you get any closer to a solution to your sleeping issues. I have several suggestions that may be helpful in both the short term but more importantly in the longer term.
First … I would suggest that it may be worth considering that there may be other issues involved in the “symptoms” you are experiencing that may have little to do with any mattress. Mattresses can’t solve physiological or medical issues although they can certainly make some difference in the comfort you experience while you are working on them in other ways.
Second … I think you are making changes (and exchanges) too quickly without giving your body the chance to adapt to a new sleeping surface or layering. As you can see in post #2 here … there is an initial breaking in period and adjustment period with any new mattress before you can know for certain whether it is working for you. Your body may also need to “unlearn” what it has become used to and how it adapts to pressure and alignment issues that are unique to you and the mattresses you have slept on in the past. I would recommend reading post # 2 here and post #7 here as well.
Third and perhaps most importantly … you have 90 days to help you discover what type of layering is the closest to your ideal and help you understand more about the types of design that work best for you. Regardless of whether you end up keeping your current mattress … the flexibility of its design means that you have a real opportunity do do some re-arranging and experimenting that can give you some insights into why you are having the issues you are having.
The type of issues you are having can be because of comfort layers that are too firm but with your higher weight it is equally likely (perhaps even more likely) that it could be because your hips are flexing beyond their neutral range and firmer support layers may be helpful to prevent your hips from overextending. Your experience on the Corita and on softer layers may be pointing to this as well. This firmer support can be accomplished by some layer rearranging (with each one being tested for at least a week) and would give you the opportunity to find out how your symptoms change (regardless of whether they are completely resolved) with different combinations of the balance between pressure relief and support.
Of course what you do is entirely up to you (and the option of a refund is one of the “values” of the choice you made) but it seems to me that you would be losing a meaningful and possibly important chance to help you understand more about the design of a mattress that may help you to the degree that it’s possible for any mattress to help and that a more “random” or “all or nothing” approach that doesn’t take advantage of the layering options of your mattress and the chance you have to gain some understanding about your symptoms may have much lower odds of success and getting you to the end result you are looking for.
Phoenix