I currently train with the GB Squad even though I shoot for ROI we do Dry fire training, and train triggering it is a big part of our training but I will say only work on one thing at a time, so one day your training goal is to have a smoother trigger so if you are live or dry firing .

This is the reason I do not like the laser dot or shooting in front of a mirror you can only concentrate on one thing at a time so if you are looking at a red dot or at the end of your gun in a mirror you cannot be looking at the sights.
I do have a list of drills and stuff pm me if you would like a copy.

Peter