How do I change the reflection strenght of a material?

Hello people,
I have the following problem…
I have a vray and 3ds Max background and have to reconstruct shaders from vray to unreal. In unreal I would be rendering everything realtime, so I cannot use datasmith.
The main problem is that I want a similat control to reflection strenght and glossiness like in vray. If I change the roughness in unreal, this affects both the glossiness and the strenght. This does not help since I want to make a material with very sharp reflections, that are however barely visible.
Thanks for the help and have a nice weekend!

I don’t know how to alter the default behavior of the roughness pin on UE4 materials, but perhaps info on PlanarReflections can get you the result you want? These are commonly used as mirrors but have a bad performance.