>>Because I want to use this gun for self defense, I've been practicing controlled pairs. Because of my goals, I believe I'm keeping my wrist solid. While a weak grip or wrist is a possibility, I think I'm doing enough to prevent that particular cause.<<

Here is the solution that worked for me. Take the 1911 and oil it up real good and put it in the safe. Now get a 4506 and use that for self defense.

I am not making light of your problem but as I've stated, I have been there and I find that 3rd gens work every time with no excuses.

Bill