Hi sdmark,
Thanks for sharing your feedback from your San Diego testing. I think it will be very helpful for others that are following in your path.
85 - 90 is the density of the latex (in kg / cu meter) and is often used by Dunlop latex manufacturers as a way to specify the softness/firmness range of the layer (Dunlop has an ILD range rather than a specific ILD). You can see some rough comparisons with ILD in post #2 here.
I appreciate your contributions to the forum
Phoenix