Hi alanx002,
The type of mattress and materials that each person prefers is entirely a personal preference and you will find that there are always people who love a particular design and some people who don’t like the same design at all but a thinner layer of latex over memory foam is certainly a “feel” that some people like and I am one of them. It gives a more resilient surface where you don’t sink “in” the upper layers as much while still having some of the “feel” of the memory foam underneath it. The specific type of memory foam can be important because any layer of material over memory foam can reduce the heat that reaches it and make the memory foam firmer or at least slow down the time it takes to soften with the body heat.
I would be cautious with buying any latex from FBM and before you make any purchase there I would read post #2 here and post #2 here.
Latex is very different from memory foam and comes in a wide range of firmness levels (unlike memory foam which is all in the soft range). 32 ILD would be on the firm side for many people although the thickness of the topper will also determine how much of the layers below it you feel. There are some topper guidelines in post #8 here and the posts it links to that may be helpful. There is also more about the many factors that can affect sleeping temperature that may be helpful in post #2 here.
Phoenix