Hi mhollas,
The best source of “comfort advice” for a mattress that you can’t test in person is a more detailed conversation with the manufacturer themselves (see post #2 here). They have more experience and knowledge about helping you match the different options they have available to different body types, sleeping styles, and preferences than anyone else and any other possibly “conflicting” suggestions would only lead more to confusion than be helpful.
I would not use a “standardized” chart to choose a mattress because these are just general guidelines and I would always talk with them in person so you can provide more specific information both about your personal “specs”, your testing experiences, and your personal preferences.
For reference … you can see the specs of the PLB mattresses in post #2 here. If you were using the PLB toppers then depending to some degree on which topper you were trying they would all be “in the range” of the mid teens in terms of ILD.
Phoenix