My 19 had a dip extractor and crazy ejection. I replaced the extractor with a non-dip and my ejection got worse.
I then polished the non-dip and it even got more crazy.
I then polished the dip that came in the 19 and the ejection was even worse than it was to start with before I did anything.
All polishing was only done on the top and bottom of the extractor.
Nothing was done on the stem or step.