The story was that Quaife delivered the contracted specification.
The only experience I have with diff was that I renewed the four thrust washers in my MGB diff. In that, the pinion setting was crucial to avoid whining and used a one use only collapsible spacer under the pinion nut. Setting up from scratch needed special tools.
DaveW '05 Red Roadster S1 '16 Yellow (Not the only) Narrow AR GDI Plus 4