Hi SleepDan,
I don’t think there is much I can add to my previous replies about different options or combinations that may be worth trying but I’ll make a few comments as food for thought.
There have been some issues with some of the PLB foundations that don’t provide suitable support under an all latex mattress and there are some retailers that suggest alternative foundations with the PLB mattresses. Of course if you don’t feel any difference between the foundation and the floor then it would be a moot point but it’s something that I would keep in mind.
Pocket coils are usually deeper in the mattress (unless a mattress has a microcoil comfort layer) so they wouldn’t affect the feel and response or the shear forces of the sleeping surface as much as the layers and components on top of the coil but pocket coils aren’t connected with helical wire to the coils beside them so they can compress vertically as well as bend horizontally and they respond in multiple directions … not just up and down.
Amazon has a good return policy.
I would certainly avoid all the major brands such as Simmons, Sealy, and Serta because of the lower quality and less durable materials they generally use in their mattresses.
The better options or possibilities I’m aware of in and around the Sarasota area (subject to making sure that any mattress you are considering meets the quality/value guidelines here) are listed in post #5 here.
Phoenix