There have been many responses to this very question before - sometimes other small size cases as well.
One answer is to replace the ball under the extractor with a larger one - you can do a search to find the sizes.
The other that I think will fix your problem is to file another .020 off the "opening" of the ejector pin which lets it keep pressure on the case longer as it is extracted - if you search there are several posts which I think even include pictures - very easy and quick fix.
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