That's true. The bounce has really come down and it's hard to hit through the surface.
Nadal's topspin is getting very LITTLE action of the surface and so he can't yank his opponents sideways (as effectively as usual) with the cross court forehand. At night this becomes almost like an indoor WTF type surface for him (that's an exaggeration, but you get my pt).
I don't think the surface benefits Fed all that much. Fed is still 2x better on deco turf where the ball zips through. Fed is the MOST aggressive player in the Big 4 and his game FLOWS on a faster court, where his forehand penetrates the surface in a hurry.
I think the surface benefits Murray the most. It gives Murray the time to line up his groundies and play defense. That's most important for him. Coz let's face it: Murray is the most defensive player in the Big 4.
I would say in order of surface preference: Murray, Djokovic, Federer....Nadal.