Hi dbison,
Thanks for the update on your Tuft & Needle mattress.
It’s at least good to see that your mattress is “closer” than the other 3 mattresses you tried even though you may still need some additional fine tuning.
Post #2 here and the topper guidelines it links to can help you use your actual sleeping experience on your mattress as a reference point and guideline for choosing the type, thickness, and firmness for a topper that has the best chance of success and also includes a link to the better topper sources I’m aware of as well.
Phoenix