I felt lucky my P10C had a 4.5# trigger out of the box.
However, it always caught up (something is rubbing) when not pressed perfectly straight back.
Even perfectly straight back it rubs a bit (very little) before hitting the nice wall and breaking.

Anyone else have this issue, and did you find a way to fix it?  I'm wondering not I'll have to open up the top-rear of the Triggerguard, where the trigger-safety slides in OR if it's the sides of the trigger that are rubbing.

My trigger did that at first. I dry fired it and worked the trigger while watching TV for the first week or so. Now it's fine. I also worked the mag release a lot during that same time. Now it doesn't require as much pressure to drop a magazine.