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There is no solid guideline for foam density. From what you are writing, it would be much easier than going through twenty questions to write exactly what this foam that you already have is.
If you have it, you can stack together like you said. There is no lab testing for that combination that I am aware of. If you have lots of it, do the entire depth with it. Combining the foam and 703 is adding unknowns to unknowns.
If you want more predictable results, use 703 etc completely.
Andre
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