Hi ommama,
There are 8 combinations that are possible with your mattress and topper.
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Firmer innerspring with softer latex comfort layer
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Firmer innerspring with firmer latex comfort layer
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Softer innerspring with softer latex comfort layer
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Softer innerspring with firmer latex comfort layer
Each of the above with the additional topper.
If you could let me know which of these 8 you have tried, how long you tried each of them, and with as much detail as possible describe your experience and symptoms on each of the combinations you have tried and compare them to each other (so I can get some sense of the effect of each change) then I may be able to get a better sense of what may be happening and how each change affected you compared to the combination before it.
This is very true (see post #4 here) but it applies to the firmness of your support layer (your innerspring) as well as to the thickness and/or softness of the comfort layers above it. If your innerspring is too soft then it would be very difficult to compensate for this with the layers above it but if the innerspring is too firm then additional layers above it can help.
It would be risky because there would be no guarantee of success but if I was determined to keep the mattress, unless there was compelling evidence that pointed against it (based on your experience with each combination), I would be tempted to keep the firmer innerspring with the firmer latex and then add a topper that can provide “just enough” additional softness and thickness to provide the additional pressure relief you needed with the leas possible risk of compromising your alignment.
Any additional information you can provide in as much comparative detail as possible would be helpful.
The most important information or “pointers” aren’t whether any particular combination “works” or not but how your sleeping experience and symptoms differ or the “direction of change” with each incremental change compared to a combination that only has one difference with the one you are describing so the effect of each single change can be better identified and that any “patterns” can become more visible.
Phoenix