I see a lot of negativity in this thread, so I haven't read it in detail, but if your problem is not solved yet, theres about a 99% chance, if the gun fully chambers, but does not go into batter, the problem is the extractor tension. I set them to 2.2LB using a scale, and this gets rid of the problem. As others mention, Kimbers can have issues, sub-government 1911's can have issues, and the combinaton can be unworkable.
To offer my help, take a fired case, whatever your favorite brand, knock the primer out, file a notch across the bottom. Run a string through the primer hole, with a knot big enough to keep it from coming through. Tie a loop on the end, mount the slide in a vice, or if you don't have one, just have someone hold it down steadily. Attach the loop to a fish/trigger scale, and keeping the case flat to the breach face, measure the force to get it INTO the extractor, not OUT OF. Take a few measurements, and tune the extractor until you reach around 2lb force required. Any more than 2.5, I start to see your issue, just my experience. The extractor on a 1911 acts as a brake to slow the slide, and if its too tight, that brake works too well. Hope this helps, I can take pics if this didn't make sense. Avoid setting your tension by hanging cases and shaking the slide. That advise is as good as stuffing pipe cleaners in an AR gas tube, or caking it in coconut oil..