Hi sweetandsourkiwi.
This is not a week link as you can see in the durability guidelines here
Nest’s old version (13.5") Alexander Signature Hybrid, was not much different from the newer (13.75") … as it had 2 x 1.5" inch of Energex instead of the 1 x 3" of Energex they are using now.
Latex seems to be a great direction for you to move into for you … just for the sake of “straightening up” some misconceptions about the Energex … this is a high-quality polyfoam, one of the newer generation of what I term “high-performance polyfoams” The foam is also more immediate in its response and not have the “hug” and “memory foam feel” quality you strongly dislike. These high-performance polyfoams also tend to be extremely durable and some of them are engineered to provide feels that are somewhat similar to latex, others similar to memory foam, and others simply versions unto themselves. TitanChill should be one of these high-performance polyfoams you’ve seen mentioned on the site described as hyperelastic which would have all the conforming qualities but less the “dead” feel that is characteristic to memory foam.
Hope this helps
Phoenix