Could potentially be another problem; if you were closer- I’d let you bolt in my pumpkin & take a spin...these diffs are pretty dang strong & take lots of abuse.
Be sure & test drive on known good blacktop, under light,normal & heavy loads...also coasting...also hopefully the biscuits that you put on the ears weren’t too thick/thin & caused a bad pinion angle; that could make trouble as well.
Having the open diff; you can practically put any kinda lube in it...may want to try 85/140 & see if it tames down....no need to use synthetic while troubleshooting.
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