Hi jethrodesign,
There are too many unknowns, variables, and personal preferences involved for anyone to make specific suggestions for a mattress or a topper based on a formula, specs (either yours or a mattress or topper) or "theory at a distance but post #2 here and the topper guidelines and other posts it links to includes the guidelines and sources I would use that can help you choose a latex topper that has the best chance of success and the least possible risk.
Phoenix