Let me know if I can help, I know your feeling when it james, it just sucks and stops you dead in your tracks.Increasing extractor tension seemed to help me. I tried by applying a slight bend, but another suggested this is the wrong approach, as the type of metal of the extractor does not allow for that. Using a stiffer extractor spring will accomplish the same result, and is easier to replace, if needed.
I had a similar extraction jam after my "fix" of bending it a couple of thousand rounds later, am very interested in trying a stiffer spring. I don't tolerate any of those malfunctions in my competition rig. The spring switch seems to be a better solution. Thanks for sharing that.
I had theorized that the loose mag fit was interfering with extraction in some way, but would like to see how this mod does, as there is not an easy way to adjust those mag guides.