Honestly, it looks like a revision is due.
1/2" longer heal should resolve the issue.
Approach them again, this time with a proposed resolution that is relatively inexpensive and a great improvement.
Ur photos/video show the issue at hand.
While a new intact rubber wouldn't extend as far back as ur ripped one and wouldn't allow the flex, the longer heal would have more contact, requiring much more force to rip/tear.
So far, the reviews i have seen on the new ski , are not favorable, those could be part of the issue.
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