I experimented with all those stances too. Isosceles, Weaver, Modified Weaver, Chapman. Got myself pretty confused.
Then I read an article by a guy named Larry Pomykalski.
Below is a quote from Mr. Pomykalski's article:
"Now, I’d seen good shooters before. I’d even studied Matt’s instructional DVDs, “Practical Shooting-Handgun Techniques, Volumes 1-3” for a month or so before coming out to train with him. But nothing I’d ever seen had prepared me for the sight of this multiple world champion lighting the afterburners and setting into a plate rack. “Fast” can’t describe it accurately; in fact, there’s no way to convey in print the speed with which Burkett shoots. Even video falls short. Suffice to say he shoots faster than I would have thought humanly possible, until I saw it myself.After reholstering, Matt turned and continued. “The forward weight bias helps with recoil management. I’ve never understood why some people shoot with their weak hand pulling in, since the gun’s coming in anyway when it recoils. When I shoot, my arms are relaxed, unlocked, and ready to absorb the gun’s recoil at the elbows.” This was, as were all Burkett’s explanations, accompanied by a clear physical demonstration. I practiced the stance and grip I’d been shown a few times, and then fired at the plate rack again, this time in my best approximation of Matt’s posture. After the plate rack was cleared, I turned to Matt. “How long have we been shooting?” Puzzled a little, he replied, “About ten minutes-two magazines.” That’s exactly how long it took for me to realize that I was about to make some quantum improvements in my shooting over this three-day period."
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I tried the Burkett technique and found I shoot much better his way. The first improvement I found was not pushing my shots to 7:30 on the target. I wasn't flinching, I was anticipating recoil. Matt Burkett's website put me onto Brian Enos' Slide Glide lube, too. That was a good day.