While I dont think it matters, but if they say to use 568B then that's what I'd do just to rule that out and get that out of the way as being a reason to place blame on your install. What I'd be more worried about is they do specifically recommend shielded cat5/6 and shielded ends. They also make it clear there should be no connecting blocks or couplers in the line. Have you adhered to both of those recommendations? And if not what happens when you string some shielded cat5/6 to test the system out?