I do not "X" wire brace my single or double braces. I use a single wire, crimped on the bottom and with a Gripple on the top for my singles and a looped wire with a strainer on my doubles.
Rather than standard 90 degree corner bracing, some of my corners are "rounded". IE; I set my H braces a few feet back from the corner then connect with a cross post at a 45 degree angle. I then "X" wire the corner but still use singles on the line bracing. Makes for a nice solid corner.
The rounded corners are good for when the horses act up and make navigating the outside corner easier with a vehicle.