Mine would hang up on JHPs when it was new.
It's not the gap, or the amount the barrel moves, that causes the problem.
If you look at the bottom of the feed ramp you'll see the ramp doesn't go all the way to the edge. There is a flat at the end of the ramp and a sharp transition from the ramp to this flat edge.
When the slide moves forward, the round at the top of the magazine can flatten out from the nose up angle of the magazine, it doesn't do it every time. When it does, this causes the edge of the hollow in the bullet to catch the transition area of the feed ramp and the round hangs up.
I took a polishing wheel to mine to smooth out the sharp transition from feed ramp to flat. Now that it has a been shot a while it no longer hangs up on JHPs. I have no idea how many rounds I have through it.