Hi art,
Just in case you haven’t read it yet … the first place I would start is the tutorial post here which has all the basic information, steps, and guidelines that can help you make the best possible choices … and know how to avoid the worst ones.
If you are ordering locally then your personal testing using the testing guidelines would be the best way to decide. With careful and objective testing your body will tell you more than any “theory at a distance” about which mattress is the best match for you in terms of PPP. If you are making an online purchase, then more detailed conversations with the manufacturer or retailer on the phone would be the best way to choose. They know more about their mattresses and the specific options they offer and which of them would have the best chance of success based on the information you provide them and the “averages” of their customers than anyone else (see mattress firmness/comfort levels in post #2 here).
While it’s usually not necessary with latex because of the way it compresses and responds … with body types that are more “challenging” because of a more athletic or curvy body (wider shoulders or wider hips for example) or weight distributions that are not as evenly proportioned it can certainly be useful and would be well worth considering. For example it can allow for the use of softer foam with more give under the shoulders and firmer foam under the heavier pelvis. The key with zoning is that the zoning scheme is a good match for your body type and weight distribution. There is more about zoning in this article and in post #11 here.
The better options and possibilities I’m aware of in the San Diego area are listed in post #2 here. You have some good options available 
Phoenix