DLL9mm - I have read similar on this issue and have not tested so far. One I also read was that the SLB of the older or a different model<21 or 30??> had a different over all length that helped the extractor overcome this issue.
Both mine are the same. If you get a chance, please try the old SLB and newer LCI extractor and see if it still produces good results. That could help narrow to the spring/bearing combo or the extractor itself.
I remember Chris saying the extractor had been changed out once by Glock in one of the returns.
I believe the 36 has the olive SLB setup.