Shower valve depth.

Should I bump this shower valve out a bit? It’s set back about 1/8th” with the GoBoard next to the plaster guard.The tile is 1/4” + thick and the thinset.

So ideally, how far back should this be set in? Make it flush to the GoBoard, leave it alone or make it flush to the finish tile?

I only have two screws holding the GoBoard up so it would take seconds to remove it and shim the valve out a bit if need be.