The reflections in that screenshot are SSR. It will provide the most accurate shadows at the moment. Reflection captures can help, but no where near the quality of SSR since it’s a cubemap applied to a sphere or box depending on the one you use. You can adjust the value of the roughness for your material and adjust the quality of the SSR in any of the Post Process Volumes added to your scene that cover the area or that is set to unbound.