hello! I do recommend reading a bit up on the whole capture topic, we have some wikis and threads with relevant information.
the tl;dr is going to be that your best and most reliable bet for capturing 60fps 4k analog glitch video without losing all of your cool glitches is using a 4k camera to record at 60fps off of an analog crt. or alternately using the 4k camera to record at 60fps off of an LCD screen if thats where it looks better. There is no other fool proof method of preserving desirable glitches when digitizing analog video.