I noticed yesterday, on the first round, I was running into a hitch at the beginning of the trigger pull. After I got home, I started looking at things, and found that if I put too much finger on the trigger, I was torquing the trigger safety, so it wasn't disengaging fully. This added the resistance at the beginning of the trigger pull. The easy fix is using the middle of my finger pad, as the P10 seems to have less tendency to shoot to the left than my Glocks.
But I wonder if polishing the third area in the diagram above would help, or hurt the issue.
Edited to add:
I think I found the answer to my question. I do not believe the issue is with the trigger assembly, but with the frame. After a little more experimentation, I found the back of the safety was getting caught on the frame, if I didn't fully depress the safety. Adding more finger to the trigger apparently was pushing my finger up on the safety, so I wasn't fully depressing it. I suppose I could remove some material from the inlet or shape the safety, but for the moment, I'm just going to try to train through it.
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