Time's have 15 0or 20 degrees depending on which cleat you mount on which shoe (the cleats are designed asymetrical for this purpose). 6 degrees seems pretty common for most MTB pedals. Since the design of the retention is nearly identical to Time's, I wonder if you could use Time cleat's and get more float out of them.
Boomer - the co. making them is CRANK Bros., not Cook Bros. I made the same mistake as you when I first read it. I'm not familiar w/ Crank Bros., are you?