... shooting to the capability of the gun. In other words, is the gun holding you back?
I agree with this and in my case I had a G34 that I had virtually motionless follow-through and I had a stock 17L that was jerking to the right.
I was new to the platform and people kept saying "you have to get used to the Glock trigger, practice practice practice, dry-fire, dry-fire, dry-fire, yada yada yada"
So I practiced and practiced. I was doing 150 dry-fire exercises every day. I worked out with GripMasters and Captains of Crush grippers to strengthen my trigger finger and grip. I actually moved up 3 levels of Gripmaster and 2 levels of Captains of Crush.
There was no improvement in my front sight twitching to the right. I'd get out my G34 and dry fire with no problem.
I finally just put the 17L slide on my G34, declared victory and moved on.