Re: DA trigger pull
are you saying its loose in the frame unless you have your finger on it? The hole in the trigger sounds like its wallowed out or the trigger is cracked. I've shot 1 px4, I don't remember the trigger having any slop to it.
Now if I'm misunderstanding you, a DA trigger will have a lot of pull or take up sometimes, but in SA mode it should be tight, no play.
Only cowards shoot with their eyes closed....