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WRT to helmet design- There is only so much force a compressive structure such as the foam can take. After that point - if there is remnant force- it will be transmitted to a) the helmet and cause a split, or b) your head.
There is a limited amount of foam that people are willing to wear, and since my helmets both showed substantial compression, I'm pretty sure they worked as much can be expected.
Anecdotally- the injuries were less severe. (this is not data and importantly why I've repeatedly stated it as such).