In addition to the advice given make sure 5/16 is the right size bearing. I rebuilt a gear box in similar condition to yours and at first sight they looked to be 1/4, but after trying 1/4 I found I had more gap than with the old bearings, I measured some of the old ones and found that they were more than a 1/4 but smaller than 5/16 to varying degrees. Tried a second time with 5/16 bearing and I came out pretty even. Yes pitted balls could cause your binding issue. In regards to your shims, that will probably be trial and error on your part. Since you say that you have a different number of bearings in each race, that would lead me to believe that the box has been opened before, so the shims may have been adjusted. Without seeing it I assume the shims adjust the end play or "slop in the bearings. If so, when you put it all back together, if the box turns hard (remove a shim), or if it has more than a 1/16-1/8? of end play (add a shim). More than likely new bearings, grease, and oil and you will be good to go. HTH
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