The "new excessive contact" rule is NOT experimental. Oregon and Hawaii have a DIFFERENT rule that is experimental regarding blindside blocks having to be made with open hands. That is not the NFHS national rule.
That being said, the "new excessive contact" rule isn't really a new rule at all. At the GHSA clinics, they said, "If it was a foul last year, it's a foul this year. If it wasn't a foul last year, it isn't a foul this year." Unfortunately, it's not a large percentage of officials that were at the clinic. I'm afraid officials that weren't there will read too much into the rule "change".