FYI, I use Samsung 65W adapter for super fast charging my S23U, without any issue.
Here are a couple of tips you can try:
1. Fast charging is almost always hotter than normal (however this will not adversely affect your device so long as you use original accessories / certified manufacturers - reason being the amount of time the charger pushes peak wattage is actually very short);
2. Some cases trap heat within the device - especially thicker ones that have shock absorbtion properties (usually made of TPU/rubber material acting as an insulator);
3. Disable fast charging in your phone - probably the best option but charging will be quite slow, and defeats the purpose of investing in fast-charging accessories.
Hope this helps!