The ejector in the first video is a secondary ejector that’s only there to eject loaded rounds from the chamber when the magazine is removed. The gun will operate just fine without it installed.
The primary ejector is a very small step on the lip of the magazine. Doing the adjustment to the tension of the magazine release as shown in the second video may help but it’s only half of the problem. The factory extractor hook does two things, it extracts unfired rounds from the chamber and provides a pivot point for a fired cartridge case after the case hits the ejector. The extractor doesn’t always hold the case in exactly the same position every time With the tolerances in factory parts being what they are. Replacing the factory extractor with an aftermarket one from Tactical Solutions or Volquartsen will fix the problem for good. Installing a Tuffer Buffer bolt stop while you have your gun apart wouldn’t be a bad idea either.
Edited to add:
I just read that you already have a VQ ejector installed. I like the ones from Tactical Solutions better. Changing to that may help. Bolt speed could also be an issue with standard velocity ammo. I’d clean the gun and inspect inside of the receiver to see how smooth it is. Another thing you can do is send your bolt to Randy at CPC. For $60 he’ll radius the rear of the bolt, adjust the headspace and pin the firing pin to limit it’s vertical movement. He’ll replace the extractor to but I think he charges a little extra for that. I’m not sure, check his website.
CPC bolt work