Hi Ana,
While a picture or visual cues can be somewhat helpful when you are testing mattresses … they aren’t as reliable as the “symptoms” you experience when you sleep on a mattress over the course of the night.
Based on your comments and “symptoms” and on the layers and components you are using … I would strongly suspect that your combination is too soft for you. 5" of 24 ILD Talalay in the top layers of a mattress would be too soft for most people and your Therm-a-rest is probably also too soft as well and could be sagging in the middle of your sleeping system. As I mentioned in my previous reply I would blow up the Therm-a-rest as firm as possible (which may still not be firm enough to prevent any sagging) and then I would experiment with different thicknesses and firmness levels for the transition and comfort layers on top of it using a “bottom up” approach. I would probably start with 2" or 3" of firmer latex on top of the Therm-a-rest and then use your sleeping experience and any “symptoms” you experience on these two layers as a guideline and reference point along with the information in post #2 here and the topper guidelines it links to to help you decide on the thickness and firmness of the top layer to “finish” your mattress (except for the cover).
Phoenix