After playing Dying Light 2 for two hours, my DeepCool AK500 hits a thermal wall, any fix?

Parkouring across rooftops was smooth for the first hour, but then the frames started dropping in a rhythmic pattern, which made me really cautious. Monitoring showed the AK500's fins were hitting thermal saturation, with CPU temps hovering between 88℃ - 94℃. I tried popping the side panel off, which dropped temps by 5℃, but my case became a dust magnet and the noise was unbearable—definitely not a long-term fix. I ended up redesigning the airflow, flipping the front fans to intake and cranking the rear exhaust to 1500 RPM to force the hot air out. The temp logger showed the peak CPU temp dropped to 76℃ - 82℃, and the stuttering stopped. I had a weird whistling sound from the top of the case at first due to uneven pressure, but that went away once I adjusted the fan orientation. The cooler base stays around 55℃ - 62℃. Ran a 4-hour AIDA64 stress test and got zero throttling, with fans steady at 1600 - 1900 RPM.