Hi Bedtime,
If I was in your shoes I would decide which of the Savvy Rest combinations was “best” for you based on careful testing and then choose your initial SleepEZ layering using the combination that was closest to your “ideal” as a reference point along with a more detailed conversation with SleepEZ who will be able to help you choose the options they have available that would be the closest or that their experience indicates would be the best “match” for you based on “averages” (see mattress firmness/comfort levels in post #2 here).
Phoenix