That's more fuel than you need unless you're escorting bombers across the map. Go with 50% and a center drop, maybe (if you even need that much!).
The thing about the N is it has the same engine as the M and the same general performance... It's just heavier. So saving weight wherever you can will help improve its overall fighting abilities. The biggest source of weight? Too much fuel.
It cruises super well on reduced settings. There's no drag penalty after you jettison a DT on it. Therefore, take less internal and load 1 center or 2 wing DTs if needed.
My $0.02. When you go light, you can make the N dance.