Hi Malachai_31,
In general thinner top layers will feel firmer because they will compress to a greater percentage of their thickness faster and will “allow” more of the firmness of the layers below them to “come through”. There is more about the effect of thickness in post #14 here. If you have a thinner top layer that is also softer it can be somewhat “paradoxical” because the softer layer will feel softer with initial compression but you will also sink into it more deeply so you may feel more of the firmness of the layer below it as well so it can have a “combination feel” of being softer and firmer at the same time depending on whether you are more sensitive to the surface feel or the feel that comes from sinking in a little more deeply.
Phoenix