How about a video of the lower clamp? From the top, it all looks ok. I don't know if it's the angle of the camera but it looks to me as though the upper blade chucks seem to be cockeyed. Like they are canting to the right. It might just be camera angle. And I did hear a noise that should not be there. It sounds like something is hitting something.
Someone suggested putting the original blade clamps on the machine to see if that changed anything. Did you ever try that? Also, maybe try uninstalling the Pegas clamps and re-installing them giving a good look at the mounting hardware while you are doing it. Maybe something is worn and you just can't see it.
When all else fails, you might have to dig deeper into your machine to see if something has come loose internally. When I got my first saw, a used Dewalt 788, it worked great but when I took it all apart to do a good service on it, I found a broken bolt that didn't find it's way out. Actually, someone prior to me had replaced a screw with a non-Dewalt screw and it was in backwards and the nut had come off but the screw was sort of trapped and couldn't fall out. Just something weird and that may be your trouble too. Remember, the Chinese have no idea what "quality control" means. Not in their lexicon.