With a center limiting strap (like yours) he can get 14” right? That’s what the bags allow.
The axle width and tire size may not allow 14" of flex, especially with the upcoming outboard. The limits and boundaries have not been fully defined yet.
I put a center strap on mine to catch the last fraction of an inch. From what I gather, Blaine prefers to not do that and makes the shock the ultimate limit.