To move that radiator is easy. On the outside of that panel is 4 small screws. That's all you'll nerd to remove. Just hold the radiator and fan when you do. Then turn it to face the back side, where that grill is and put those same 4 screws back on, from the outside. Done. That's 1 easy chore done.
From glimpses I could catch from the video, it looks like you have no fans installed at all. It looks like you have room in the front for at least 2x 120mm. You need those fans there. Very important. That wiring is a mess! Bundles like that get in the way of airflow, like when you stick your arm out the window of a moving car, you can close your eyes and tell exactly where the mirror is because there's a blank spot where air doesn't hit. Get those wires from the psu tidied up and stick up top where the optical bays usually go in older pc designs. The orientation of the fan on the radiator is perfect, that's push, so the radiator will act as an exhaust fan. Yes, your case is limited, but do add that floating fan to the side panel, where the radiator was before, as exhaust, blowing air out of the case. This will give you 2x intakes, 2x exhaust, which should be plenty. If that means you need to go buy 2x more fans for the front, so be it.
One thing to remember about Intel cpu's and liquid cooling. Intel cpu's have a hyperactive temp sensor, so temps bounce very quickly from low idle to 50's with little usage, easily. But thats nothing worth worrying about, it's normal cpu bahavior. Liquids take far longer to change temps, try watching a pot of water boil, the pan gets hot extremely quickly, the water takes forever to heat up. Same with liquid coolers, it takes a good half an hour run to raise the liquid temps, so any temp readings taken before that half hour is up are suspect.
Get some air flowing in that case. Cold air in, hot air out