Hi ckollars,
Softness and firmness is very subjective and relative and each person experiences it differently so a mattress that feels too firm for one person can feel too soft for someone else depending on their body type, sleeping position, and preferences or sensitivity and what they are used to sleeping on in the past and are using as a reference point for soft or firm. It would be similar to “sweetness” or “saltiness” where a food that tastes too sweet or too salty for one person won’t be sweet enough or salty enough for someone else. There are also different types of softness and firmness that different people may be sensitive to (see post #15 here). Higher body weights will generally feel more of the effects of the deeper layers more than lighter people.
The most likely short answers though would be that either one or more of the layers are too firm for you or the mattress is thinner than you may do best with (see post #14 here) or the thick vinyl on top (and possibly the thick mattress pad as well) is interfering with the response and contouring of the latex underneath it. There is more about the different factors that can affect how soft a foam feels in post #4 here.
The specs you listed also don’t seem to be correct (the densities you listed don’t relate to the firmness levels for Talalay). Did you buy the mattress as a complete mattress or did you buy the layers individually … and where did you purchase them?
Phoenix