Indeed, enabling backface culling can be important to avoid “shadow acne”.
If you happen to make another post regarding your personal projects, I might encourage you to do so in a separate thread here on the discourse forum, as this is the “Showcase” post for complexpbr. Others may be more likely to assist you with commonly encountered game development problems that way as well.
One more note about SSR – it’s a tricky effect to dial in perfectly, and is related to both the size and the composition of a particular scene. I’d suggest many of these kinds of effects are fairly broad game design considerations and could be approached in the greater forum. Happy game developing!