Hi simonemarie,
Your thinking is exactly along the lines that I would be using.
A 6" 36 ILD latex core is certainly a firm support core by most people’s standards but a 2" comfort layer of 32 ILD would be quite firm by most peoples standards for a comfort layer and would be more typical for a middle transition layer (unless someone was a back sleeper or much heavier than average).
As you mentioned … I would tend to add a topper to your mattress that was designed to give you the pressure relief and “comfort” you are looking for because the layers in the mattress would be ideal for this.
The key is to add a topper that would fit your needs and preferences and be thick and soft enough to provide you with the pressure relief you need but not so thick and soft that you are too far removed from the deeper support and transition layers so you aren’t risking support and alignment.
In essence yes although t would depend on your weight, body type, sleeping positions, and sensitivity to pressure issues. You certainly won’t “bottom out” on this mattress (even what you have isn’t bottoming because it isn’t fully compressing but it’s just too firm). As you mentioned … softer upper layers will compress more than deeper firmer layers.
Some guidelines that I would use for choosing a topper in terms of softness and thickness are in post #8 here. The 2" “transition” layer means that you would probably need less thickness than if the topper was right on top of the firm support layer itself. Post #2 and onwards in this thread may also be of interest (to highlight some of the factors involved and questions that need to be asked and answered in making your best topper choice). A topper can certainly make a significant difference in how a mattress feels and performs and is a great way to soften up a mattress that is too firm for good pressure relief.
Probably the “safest” and most “average” choice in a latex topper would be 2" in the range of 19 - 24 ILD but this would vary widely depending on the specific circumstances or on your best subjective estimate of how much more softness you feel you need…
Hope this helps.
Phoenix