Hi mg517,
I scanned your previous posts on the forum and my replies and there isn’t much I can add in the way of suggestions to my previous posts but just as a reminder I would keep in mind that you are the only one that can feel what you feel on a mattress/topper combination and there are too many unknowns and variables involved in choosing a topper that are unique to each person to be able to predict which topper would work best for you on the mattress you would be using it on with any certainty.
You’ve probably also read this as well but there is also more information about how to choose a topper in post #2 here and the topper guidelines it links to that can help you use your sleeping experience as a reference point and guideline to help you choose the type, thickness, and firmness for a topper that has the least possible risk and the best chance for success. It also includes a link to a list of some of the better online sources for toppers I’m aware of.
Just out of curiosity … based on your comments here I thought that you purchased a Charles P Rogers Cool Ultra mattress. Did you return it and purchase the Summit mattress you linked from Shovlin or was that an additional purchase?
Phoenix