Good morning- 1st post here, I think, so sorry if this has been covered--the "search" feature didn't turn up what I was looking for. I am now the very pleased owner of a G19 and G26, both Gen 4, and my question is about the different-sized backstraps. Other than "use whichever one feels best" is there a rule of thumb, of sorts, for determining which one is the best to start with? I've tried them all with numerous dry-fire exercises and a few rounds through the pistols, and they all feel "okay." The difference being how much of my finger rests on the front of the trigger guard--everywhere from "the tip just barely" to "right in the middle of the first pad." So, any thoughts or advice, much appreciated.