Regarding the shimming of the diffs. Please look at the last page of the manual (the parts page) and you'll she that the UM610 code the shims are 0,50mm and not 0,10mm or 0,15mm that are including in the kit.

If you have any problem you could add shims to bottom and top, then close the diff and check if it spins.Add shims as many as when you add 0.1mm more the diff not working free.