Installed the 280mm on i7 12700K. there was not any washer included in the 12700 bracket. Idle temp is in the 30C, Top out of 49C while playing World of Tank. In Warzone top out at 65C. All at 2560 x 1440 Resolution.
Check Tu or Th around 9:00 AM to 10:00 AM. BB used to drop every two weeks. I don't know about now. It took me 2 months to beat a bot and got a 3060 FE on Jan. Good luck.