@ Gloc9mm ... Hate to tell you this, but the feed/eject problems you're having with the PPKs may be "YOU" & not the gun. For some strange reason, that PPKs has a hellava kick for it's size & cartridge (380). In fact, that little bastard seems to kick harder than my Taurus PT145 which is a .45 acp. ???
The point is, if you are not holding the gun tight enough & it rotates in your hand on recoil ... you are actually dampening the force of the recoil needed to properly cycle the gun. It doesn't take much.
Take the gun out of your safe & go back to the range. Start off by holding onto the gun with 2 hands tightly, while also exerting a downward force on the table = so the gun can not move up and/or back.
You may find your feed/eject problems have magically disappeared! Also, to start with, use ball ammo. Thereafter, you can work on your grip, once you're aware of the problem. Good luck.