hey,
I too have mine slopey side up. The main reason I have them slopey side up is that they seem less harsh on the skin this way. I don't know why but after a session on the wall, I am able to get a much better session on the board with them turned this way, and have actually found it a bit easier than incut side up. Oh yeah, I am using the small metolius brand rungs. not sure if this is the same kind thats in your gym.
thanks ww