While it can take some abuse, it was never designed to slam home on a chambered round. As posted, it was designed for the rim to slide up behind it. Polishing the chamber lightly can't hurt, and may help.I apparently need to shoot and look at my 1911 more, I thought it was similar to others where it had a spring system that would make the jumping the rim part easier,
Never be afraid to upgrade to better parts on a 1911.
http://www.midwayusa.com/product/10...f-extractor-1911-9mm-luger-38-super-series-70
http://www.midwayusa.com/product/295888/ed-brown-extractor-1911-9mm-luger-38-super-series-70-blue
http://www.midwayusa.com/product/10...e-extractor-1911-9mm-luger-38-super-series-70
Might as well consider a good FPS if you do.
http://www.egwguns.com/firing-pin-stops/