My PSU is:
FSP Group Mini ITX Solution/Flex ATX 80 Plus Gold 500W High Efficiency Power Supply (FSP500-50FGGBN)
With this setup, I've only played Forza Horizon 4 at max settings, 1440p, 144hz g-sync, temperatures are actually not great...
CPU 70c
GPU 84c - hitting thermal limits, preventing full boost
Fans on "Standard" in AI Suite 3
My temperatures were actually better with the 120mm AIO, and 92mm top exhaust fan, the temps for the same game were:
CPU 70c
GPU 77c
The case is designed with the intention of mounting the radiator 25mm away from the case ceiling. With 15mm fans, the radiator interferes with the ceiling, and I had to shim the fans away by about 2mm. I believe that my build isn't getting hot air out as effectively as a dedicated 92mm fan. The two slim 120mm fans are also less optimized for static pressure, and are less effective at exhausting as well.)
I made the fan curves more aggressive, and had much better results... Good thing the Noctua slim fans sound better than any other slim fans I have. With the same gaming settings as above, here are temperatures:
CPU 60-70c
GPU 65-79c - continuous boost enabled now
Bottom fans intake 1700 rpm
Top radiator fans exhaust 900 to 1700 rpm
AIO pump at max