Well, as I feared, taking the shim off the rear diff was a step too far, I chipped the teeth on the bevel gears. Fortunately, shimming it back up tight kept it running for the final.
Unfortunately I could not get my hands on any fine shims today but I think these will greatly improve the mesh for the future.
I'm kind of left wondering today whether I have got a bit too obsesed with the drivetrain... unfortunately I didn't see any other B-MAX4's at the NE regional today so had nobody to compare notes with!
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