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Are you using the tip of your index finger to squeeze the trigger? I was told by my cousin-in-law who's a LEO to shoot with the tip of the 1st digit of the index finger. I was always used to shooting with the joint between the 1st and 2nd digit of my index, not because it was intentional but simply because it's where my finger naturally fell. IDK if this will help your situation or not because it kind of hard to visualize your problem.

Edit: I Googled it and this guy might have a fix. http://youtu.be/5xaeuW8SEcE Funny I have a have a G27 and large hands and I've never experienced this problem, maybe it's because I shoot with gloves on.