Thanks for the replies.

I can not use the middle finger with a revolver. Also, my 1911's just do not fit right. The 1911's all have short triggers and extra narrow grips.
I will not be using the middle finger this weekend at the USPSA match. i will have to practice it more.
The fact that I hit to the right is mind boggling to me. Never happened to me before. In a 2 hand hold I do not lose any control of the pistol. I have never hit like that with the M&P 45. It has been my dream for years to error to the right.

BTW, Massad Ayoob, in his book did not speak favorably of this method.

The best outcome would be that this middle finger method allows me to correct trigger errors and I end up using the index finger.