Personally, I set my disks up with the slots perpendicular to the boards edge (so I don't have to mess with my heelcups). Straps are out of the box perfect for my 10's.
Sweet thanks for the tip and info, just got a sweet deal on the 2011 union atlas glow bindings. So I am going to try what you said so I don't have to adjust the heel cup even though I have size 11's. Thanks a lot!!!