When you say enable Continuous Collision Detection on the player’s collision do you mean the Capsule Component, the mesh itself or the Jump Collision? I wasn’t sure so I tried enabling Continuous Collision Detection on all three to see if that would help, unfortunately though, it didn’t really seem to make much of a difference.
As for the issue of the Launch Character node, I’ve suspected from the beginning that it was causing at least some of the problem since the player would noticeably take damage much more often when the jump button was being pressed. However, how do I make the player fall without the use of the Launch Character node? Unreal Engine 4’s built-in Stop Jumping node doesn’t cancel the player’s jump when the jump button is released and I’m not sure what other alternative there is. I tried looking at the thread you posted but everything suggested within it goes way over my head.