Couldn’t sleep so I finally got up and decided to look at this issue again.
What I found out is that all three mags have a little bit of movement when installed.
So I installed the promag with three rounds kind of slamming it in there and noticed the first round is really sticking up (more than it was after I loaded it.
I let the bolt slam shut and it fed in. So then second round was sitting more normal and I knew from experience it was going to hit 1/2 a chamber low. So at this point I move the end of the magazine forward (bottom of magazine held with finger pressure forward to muzzle end). Let the bolt slam shut on its own and it went in (but not as nice as it should of).
I cocked it and doing the same procedure it fed the round into the chamber just like the second round.
Then I try the new m&p mag using the same procedure. I could not get a round to feed no matter what I did.
The new mags seem to have a stronger spring but the angle on the lips seem to hold the round a little lower than the promag.
Wish it was an easy answer and I did have the compact mags but I’m pretty sure I don’t. Searched the mfg part# and came up with full size mags.
Thinking I may have messed something up slamming the factory mags in to latch. Tomorrow I’ll remove the mag release and inspect.