Yeah thats a nice stuff , i use it for many games, but you need to be very careful with the bottleneck, GPU can easily break, just keep monitoring temps and using of cores.
as DLSS with that or any other option, Performance always!
Performance in this situation to balance with the DLDSR, and Performance without to because Quality can give Delay on GPU to deliver.
DLDSR Performance always and i put 70% always!
If puts alot of stress or fps lost in game, the options in-game that i tweak down first is :
Croud
Car Reflections
Ground Cover
If you still need a little more maybe :
Trees
Shader
If you are getting alot of shining, or inside the car alot of sun shining in the mirror, post processing..
Tell me what you think about the Performance with 70% tweak, you notice some difference? obvious depend on the gpu to