A 240mm cooler should be able to cope with a 7600 non X easily. Check your block and bios settings if you don't have any setting pushing the CPU over stock levels.
How long you've been using that AIO? They will loose efficiency over time. Check tubing and pump sound.
Do you made sure that the AIO is AM5 fully compatible?
Lastly, theres always curve optimizer or undervolting. This way I can keep a 7950X happy and rendering bellow 80ish with a RoG 240 Ryujin. And hitting 5.7 or 5.8ghz when it needs.
The Englishman