I just read one of the links previously posted about the 5 lost secrets. That is a misnomer. I teach all of those except the crush grip. In fact, I'm opposed to the crush grip technique.
I have found that most students who try that grip and cross their thumbs, miss low. The article states that it will eliminate the possibility of "milking" the grip, but that's false. In my experience, it enhances that very thing. Here's why, you can't maintain the crush grip.
Try this, grip the gun as tightly as you possibly can. How long do you think you can hold it this way? A minute? Less? 10 seconds? The truth is that any distraction, no matter how small, will cause most people to relax that grip at least a little. Then, when the shot is necessary, they instinctively tighten the whole hand as they shoot because they are trying to crush the grip. This usually results in pulling the muzzle down dramatically.
Hey, if it's working for you, great. Continue doing it. However, like I said before, there is no one correct way and all have some issues. I choose to use the grip that is going to get me the best hits.