Hi decuevas,
I would keep in mind that different people can have very different perceptions of firmness and softness compared to others and a mattress that feels firm for one person can feel like “medium” for someone else or even “soft” for someone else (or vice versa) depending on their body type, sleeping style, physiology, their frame of reference based on what they are used to, and their individual sensitivity and perceptions. There are also different types of firmness and softness that different people may be sensitive to that can affect how they “rate” a mattress as well (see post #15 here) so different people can also have very different opinions on how two mattresses compare in terms of firmness and some people may rate one mattress as being firmer than another and someone else may rate them the other way around. This is all relative and very subjective and is as much an art as a science.
As I mentioned in an earlier reply … it may be a good idea to test some “firm” latex mattresses locally to see how they compare to your mattress so you have a better frame of reference and I’d be happy to let you know about any of the options or possibilities I’m aware of in your area so you could check and see if any of them carry any “firm” latex mattresses.
Phoenix