I can't go with high clock anyways, too unstable on my cubes for some reason, most of them at least... On low clock I see no difference in my hash rates using just the one proxy, but what I did notice is that one of my cubes took a minute to talk to the pool, which makes me think it was stuck in some type of queue behind the other cubes- I used to see small delays on my pool back when I was trying to jam 10 blades on a single slush proxy.