Too Hot

I have had to send rads back, they do make mistakes, and also faulty parts.
If you have access to an infra red camera, here some pix Dana shot, showing plugged tubes, and hot water by-passing past the sides of the plugged finned area.
See if you can find a way to get a similar picture,
You may be able to find "cold tubes, or an area of cold, just shooting with a gun.
My Gut says the rad, if nothing else has changed .
Check all the pix

https://www.forabodiesonly.com/mopar/threads/radiator-temperature.547607/#post-1974426540
Good luck