I polished my extractor in my Gen4 G19 with all the updated parts the other day and tried the gun out. With just the top and bottoms polished until it was pretty shiny the ejection was alittle better but I was still getting a few cases to the head. So then I started taking some off the step, it took a couple of tries and I think I got it right now. I only had 5rds left after making the second adjustment to the step, but all 5 casings ejected to the right and made a high arc out of the gun and landed in a fairly nice pile.
Also, I was wondering how will the extractor act if you remove too much material? I have enough taken off the top/bottom so that the extractor falls out under it's own weight. I only took enough off the step to remove the blueing and maybe a touch more.