Hi rob2121,
Thanks for the update and feedback … I appreciate it.
Most foam mattresses (with a few exceptions) don’t have or need edge support but for those that sleep with their weight on the outside few inches it can certainly be a preference. There is more about edge support with foam mattresses in post #33 here and post #3 here. Your top layer is also quite soft for your body type which can also make a difference.
There are a few other forum members that have mentioned that they prefer a memory foam latex combination for their comfort layers vs two latex layers so you are not alone in having that as a preference.
Phoenix