Hi Rob,
Your own careful and objective testing would be a much more reliable way to tell whether any mattress was a good match for you or which one was the “best choice” in terms of PPP than any “theory at a distance”. I really can’t feel what you feel or see you lying or sleeping on the mattress 
The 27 ILD top layer in the Nutrition is 3" thick so it would be more than a “superficial” top layer and the softer foam below it would be compressing much less than it would if it was in the top layer. There is more about dominant layering in post #33 here and the posts it links to.
It’s not too surprising that the Pamper was a little too firm for you and that the comfort layers weren’t thick enough to “fill in” the recessed gaps in your sleeping profile since it only has 2" of softer latex on top over a firmer 40 ILD support core and for many people this wouldn’t be thick enough to provide enough good secondary support. There is more about primary support, secondary support, and their relationship to pressure relief in post #4 here and the posts it links to.
I’m guessing you mean an adjustable foundation and you can read my thoughts about them in post #3 here and the adjustable bed thread that it links to which also have more information about the various options and choices that are available and some sources that you can use to make pricing comparisons if you choose to go in this direction.
Phoenix