451 overheating, even when moving

Looks ^^^ like your 2 electric fans are mounted inside the flat box shroud, only allowing them to pull air from the 2 Bullseyes directly in front of them.

Would say this layout is better run without the shroud so that it is not blocking airflow from around the rest of the radiator core.

Screenshot_20230708-143902_Firefox.jpg

Now if you choose to run the flat box shroud, the fans should be mounted on the outside (engine side) of the shroud like Champion shows in their advertisement so it can pull air through the full radiator core.

Screenshot_20230708-144145_Firefox.jpg

Your coolant recovery add on bottle is a good idea so that you can run a 100% full cooling system.

20230708_144349.jpg

☆☆☆☆☆