Some shops pour and line bore to a full pack of shims...030 on the rods,.015 on the mains,the shim packs peel at .001.
Burnishing,the act of running in (or dragging in) a bearing has been done for years,Fit it the way you did and you don't have to wonder if its right,you know its right. Timesaver is a product used to aide fitting as well.
https://www.newmantools.com/lapping/time.htm