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It's been danced around, but I have not seen it mentioned directly in this thread - involuntary hand clenches. I know Excalibur and others have posted about involuntary and symmetrical clenching before, but I think it would be good idea of many of our users to review their trigger finger index position honestly and see if they should adjust.

From the article, the 3 most commonly identified causes :

1) Postural Imbalance. When the shooter loses balance or trips, his hands will clench.
2) Startle Effect. When the shooter is under stress and surprised, there will often be a hand clench.
3) Interlimb Interaction. Under stress, when the non gun hand closes violently, the gun hand will clench, spontaneously duplicating the actions of the non-gun hand.

While we all know that that finger needs to be out of the trigger guard, even a finger indexed low on the frame but out of the trigger guard is susceptible to finding the trigger on an involuntary hand clench.

Personally, I recently have switched to the alternate bent finger position that Massad has advocated.