I've never hit the black gold but I think I have the opposite problem as you. I hit my irons really high as is, and I'm trying to knock the ball flight down. It went way down at the demo day when i hit the X100....I just didn't nearly like the feel as much as the project X.
I'm just trying to get the feel of the project X and the flight of the X100. I ended up ordering the non-flighted project X (satin colored) because they are supposed to have a much lower ball flight than the flighted one. We'll see.