You can buy proper crank shims for av10 from mir35. They come in packs with different thicknesses in .1mm increments.
If you take it apart dremel out some trashed bearings so you can slide them on and off and take some measurements and figure out how much shimming you need. Then you can play around with different shims and slip fit bearings every time you build an engine.
There are still some super late oem mbk51 cases floating around out there that cost about the same as the rsm or teknix cases if you find out the ones you have are machined wrong.