Neither of my factory mags ever ran well. I played with the feed lips until the cows came home and it made very little difference.
Could it be the gun? Did your replace the springs? I have a P-38 and fooled with the magazines forever, then I replaced the springs with a Wolff kit and it runs flawlessly.
https://www.gunsprings.com/CZ/82 & 83/cID1/mID16/dID92