D.Carden,
I agree with SRT Driver and Kevin: try putting more finger on the trigger.
When shooting a 1911, I use the end of the pad of the trigger finger. For revolvers, I use the junction between the first and second pad of the trigger finger.
Glock finger placement is somewhere in between the 1911 and revolver.
You also discussed getting a trigger stop on your Glock. On his web site, the Burner suggests that a trigger stop that only allows limited overtravel can CAUSE you to shoot to the left. I suggest you read that blurb.
I'm confident you'll work through this issue. Good luck.