In direct response to this:
What are the things that Glock shooters wish they had been told when starting out?
My answer would be learn from the start to allow the trigger to reset under recoil. It should be reset as the front sight settles back into the rear sight My job went to Glocks a long time ago and our transition training did not stress this. When a well known instructor suggested this at a class, it was truly a "duh" kind of moment.