Correct box reflection/Sky light settings

Good day guys,
I have an issue trying to have a correct reflection.
So far my reflection got the ground black in a weird way.
All the env is baked, only the grey square on the ground and the actor will be moveable.
Also I’ll need to use the Sky light as moveable to be able to use Distance Filed Ambient occlusion for the Actor in the middle of the scene, that make the reflection even worse.
Some screenshots
This is my Env

Here is the box reflection setup

Sky Light Stationery, Reflection preview

Sky Light moveable, Reflection preview

Do you know if there is a way to combine Distance field Occlusion and a correct Reflection?
Thanks in advance guys

Cheers,
Matthieu