Just so happened, before all this Wuhan Virus fuss got going, I was shown a MantisX trigger tool.
Wow, just stepped dry fire up to a whole 'nother level. After about 1,000 rounds I finally got to the range (The outdoor range. The fresh air and sunshine range.) and I could tell I was at a higher level in shooting plates. Not just with the G17, but with my 1911 and my revolver as well.
Here's an example of a target I did earlier on, then the MantisX analysis of what I was doing with the trigger and hold.