See the ejector to factory extractor conversion in the FAQs. The factory cam doesn't have the capability of increasing the extractor projection, using an ejector instead of the extractor and a small spring between it and the extractor cam provides all the extraction range the action will accommodate, it can't extract any further than the standing breech, in fact it must be slightly short of the standing breech face, or it's hard to get the round past the ejector post.
Tim