I've put approx. 1k rnds thru mine since replacing the slide lock spring, and only once did it occur in that time. My friend was firing it, but I'm not sure if that was a factor. I also polished the feedramp, you might want to try that as well since you said changing ammo altered the results. I changed the recoil spring and mag springs as well, trying to fix the problem in addition to the brass ejecting 20-25' from where I fired[it didn't

]. I am glad to be in the position of giving advice rather then needing it in this case, as it was quite frustrating when it was happening to me, so I sympathize with you. Good luck and keep it pointed downrange.
