Hi dsw61,
Thanks for the update and for taking the time to share your comments and feedback. It certainly sounds like you are making some good progress
Most of the ILD’s you will see in North America are measured at 25% compression although the ILD of different types and blends of latex aren’t really directly comparable to each other (see post #6 here).
While different manufacturers can use different “word ratings” for their latex layers … most people would consider 30 ILD to be more in a medium range than firm.
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I may have linked this in a previous reply but there is more about the pros and cons of a wool quilted cover vs a thinner and more stretchy knit cover post #6 here.
You may have seen this already but just in case there is more about the pros and cons of different types of mattress protectors and some examples of each of them in post #89 here.
I’m looking forward to finding out what you end up deciding for your final design.
Phoenix