Phoenix:
I have been able to try my mattress configurations for another week, and then I tested a few changes. Here are my findings:
#1) 6" 32 ILD + 2" 21 ILD + 2" 21 ILD: No hip pressure points. But after a few days, I started to experience alignment issues. I would wake up with pain in the lumbar zone area. I also continued to experience pressure points in my shoulders after a few hours (on the side touching the mattress). So, I decided to try a few more things, which at least, provide additional data points that can be used for comparison purposes…
#2) 6" 32 ILD + 2" 21 ILD: the alignment issues went away, but this configuration felt too hard, causing pressure points in hips and shoulder areas. I also tried…
#3) 6" 32 ILD + 2" 21 ILD + 2" 4lb memory foam (which I borrowed from the guest bedroom): No hip pressure points, but the hips felt less supported than I would like… although I did not experience pain in the lumbar area or any other alignment issues. This was a surprise to me, because I thought that this configuration would cause more alignment issues than #1. Maybe I am sinking-in more evenly. The second surprise was that the shoulder that is in contact with the mattress started falling asleep. I have no theory for this one. Using foam from my previous Beautyrest mattress, I tried…
#4) 6" 32 ILD + 2" 21 ILD + 2" 3lb memory foam: this was too soft all around and I decided not to even try it during the night.
Based on this testing, I have developed the following hypotheses:
a) since 6" 32 ILD + 2" 21 ILD + 2" 21" ILD appears to cause alignment issues and 6" 32 ILD + 2" 21 ILD causes hips pressure points… it is probable that 3" of 21 ILD (on top of the 6" 32 ILD core)… would provide a good balance for the hips (no hip pressure points and no alignment issues).
b) some of the shoulder pressure point issues may be related to uneven sinking-in. In the 6" 32 ILD + 2" 21 ILD + 2" 21 ILD configuration, I feel that my shoulders are not sinking enough into the comfort layer. But this may be relative to my hips sinking too much. Could a more even sinking-in help? I do not have the knowledge or experience to ascertain if this is a valid hypothesis, but it lingered in my mind, and I thought I should ask you.
c) a layer of 2" of memory foam on top does not appear to work for me (I tried to find 1" memory foam in 4lb or 5lb density, but I was not able to find a site with the Certipur-US logo which offered it. RMM, which sells Certipur-US foam, is willing to cut a 1" piece but recommended against it).
Depending on your feedback on these hypotheses, we can define the next steps. Even if you agree with the hypothesis that 6" 32 ILD + 3" 21 ILD is likely to work for the hips, I do not think it will work for the shoulders. But maybe a 6" 32 ILD + 2" X ILD and 2" 21 ILD… with X having a different ILD for hips and shoulders could provide a viable solution.
I must say that I am glad that I embarked on this journey. Although this step-by-step and trial-and-error process takes a lot of patience, I feel that I am making progress and I am a lot closer to a good mattress than I ever was with the multiple S-brand mattresses I purchased over the years.
Let me apologize for the structure of the note (too many years in an engineering setting). Thanks so much for your attention!!!