I don't speak for AMD's driver team. Nobody here does. These are USER TO USER forums. My guess would be that being an Unreal Engine game this game is likely tuned more to the green team. This game was just recently released as early access so it is a work in progress and likely the game engine itself is still not optimized. Try turning down the particle effects if they give you a setting for it. This usually helps AMD cards greatly on UE games.