22 Ball Diff Thrust Race Washer Smashed

[Cremegg]

Hi

I was wondering if anyone could help on the following

I put a new ball diff in before I went to southport last week and ran my car, 4 round in my car was getting no drive

Took the diff out and found the one of the thrust washers had completely eroded down and broke into little bits.

I Rebuild The Diff Again And the Same thing happened after 4 rounds and a final (got through the meet but only just)

Has anyone experienced this before?

Was this because the diff was too tight? I can't find out why?

I've built the diff from a few videos I'd seen using the correct materials and grease

Any help would be grateful

Many thanks