All the techniques of improving ejector function are listed in the FAQs, but none are as effective as a factory style extractor or a modified ejector using the factory extractor cam, those are also covered in the FAQs.
Insufficient resizing handloads can cause sticking brass but along with that comes inaccuracy, and it wouldn't apply to factory ammo. I'd polish the chamber per the FAQs and do the ejector tune up to see how it works. Usually brass is barely stuck, so it doesn't take much improvement of the ejector function to get it to work well, I've had stuck brass fly out while I was retrieving a rod from behind the firing line!!

Tim