With a 162 wide and 11.5 boots, and that stance width, you shouldn't have any issues. Try higher bindings angles 6/-6 is pretty low (each notch on the disc is 3*). You don't need to have them symmetrical to ride switch, but if you like it that way, try maybe 12/-12 or 15/-15. I would also set both bindings in the same set of holds on the mounting plates. Keep in mind, it's ok if the boot sticks over the end of the board, the important thing is that it doesn't stick over to the poin that it will drag in the snow when you are up on your toe edge.