XJet

But surely the prob hub will still compress until almost all the load is taken by the dowels or carbon -- effectively meaning that you're no longer spreading the load over a wide area but concentrating it on a small one.

I'd be concerned that this might then cause premature structural failure of the prop due to splitting, as the torque is now being transmitted through those dowels and not by the hub and washer themselves.

How hard can it be to simply re-torque the prop bolts at regular intervals anyway?