Hi thecountzero,
One of the disadvantages of being an informed consumer is that there are so few of them that its easy for salespeople to get lazy and not offer to call the factory to find out the foam density information you need or to ignore the request completely.
Unfortunately the specs you listed still don’t include the foam density of the polyfoam layers in the mattress so it’s not possible to make any meaningful comments about them.
You can see from post #16 here and this thread and post #5 here that they have provided them to others so perhaps the salesperson at the location you were visiting just didn’t want to take the time to find out the information you needed.
Latex comes in a very wide range of firmness levels and there are many versions of latex mattresses from the very firm to the very soft but it’s clear that this one wasn’t the type of latex design or the softness level that you would prefer.
You certainly could but I would call them first to make sure they will provide you with the information you need so you don’t go there only to find out that you like a mattress but aren’t able to find out the information you need about what’s inside it to make an informed decision.
You also have many other good choices in the general Boston area that are completely transparent about the materials in the mattresses they sell and between them sell a wide range of latex mattresses (including Spindle Mattress who are one of the members of this site).
Phoenix