Yeah, I didn't make very good friends with ceramic balls either!
My experience is also that the diff lasts longer with steel balls. I also find it easier to adjust the diff with steel balls. It feels a bit on/off with the ceramic balls (too loose or too tight is very close to each other).
And as I understand most UK racers just re-use the steel balls and only grind down the rings. Which must mean that even the steel balls don't wear. Never tried myself though, always replace the balls...
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