Hi jairpeb,
I don’t know the thickness of each layer and they would be the most reliable source of information about the more detailed specifics of the mattress or the firmness of each of the layers (although I would guess that the post you are referring to is probably correct about the ILD’s since the information they posted came from SleepEZ).
You can read some general comments about mattress thickness in post #2 here and the effects and pros and cons of thicker mattresses in post #14 here but you are the only one that can feel what you feel on a mattress and there are too many unknowns, variables, and individual preferences and sensitivities involved to be able to use a formula or for anyone to be able to predict how a specific mattress will feel to you or to make a specific suggestion or recommendation about which mattress or combination of materials and components would be the best “match” for you in terms of PPP (Posture and alignment, Pressure relief, and Personal preferences) based on specs (either yours or a mattress) or “theory at a distance” that can possibly be more accurate than your own careful testing or personal sleeping experience (see mattress firmness/comfort levels in post #2 here).
I would also make sure that you’ve read post #13 here which has more about the most important parts of the “value” of a mattress purchase because the “commodity value” of a mattress (the price per inch of the foam materials, the price per yard of the fabrics, or the price per pound of natural fibers) will have very little to with how well you sleep on it or how long you will sleep well which are the two most important parts of the “value” of any mattress purchase…
As I mentioned in my last reply … when you can’t test a mattress in person then your best source of guidance about whether any of their specific mattresses are likely to be a good “match” for you in terms of PPP (regardless of whether it’s likely to be suitable for someone else) will be a more detailed phone conversation with SleepEZ who are in the best position to help you decide whether it would be a good choice for you.
Phoenix