One big innovation with the Hypercarbon series was the introduction of women's specific design features. They were the first to do that.
Also, after I talked with John Tytus about it, turns out the reason that the boats have come in lighter than listed is because the listed weight is assuming that a buyer gets the aluminum wings on the boat. If they get carbon fiber, the boat will come in lighter overall. My bet is that when they transitioned over to using a different composite process on their carbon riggers, they saved a ton of weight - I remember the older carbon riggers tended to have more of an edge on them, and the newer ones are a bit more streamlined. And if adding a 15lb stone in the boat is tough, having to go back over a boat and figure out how to lay down an additional 15lbs of CFRP when a customer decides to go with carbon-fiber riggers instead of aluminum is much more difficult!
There's always going to be variability with boat weight - if Pocock decided to add more material to the shell, or market the weight assuming carbon riggers, no doubt folks would be talking about how they are coming in OVER weight if they got the heavier riggers.
A few other things Pocock did - the first composite monococque 8 in production (not one-off or prototype), The first to integrate 4-axis CNC lathing into the plug production process - and the first and only (IIRC) to use a single plug for their production. The glue process for the hypercarbon deck isn't much changed from the C8 series, but for a monocoque boat, there's only so many ways you can attach a deck, since you don't have any ribs!
And while Hudson did play with carbon fiber riggers before Pocock, they were fixed use - those Big Z riggers were even lower over the footstretchers, and you couldn't bucket rig or starboard stroke with those riggers.