The reduced beat rate is a good explanation for the 80 hours.
But the 60 hours is also a vast improvement and I doubt the 7750 spares room for an extra barrel.
And what does it mean they "improved the barrel"? It's just a case for the main spring so what is it about the barrel that could make a difference? It has to fit in the same base movement so they cannot just make it bigger.
Are you sure about that? Teddy Baldassarre describes the 2894 as modular and the 7750 as fully integrated:
https://youtu.be/vhuGBju0I3I?t=132 (at 2:12)
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