I would disagree, I have repeatedly used 4000 mAh flying F-11, and P-11 in certain conditions. Sure you can do 3300 mAh under the right conditions, but you are leaving no room for any modification of your flight.

Go out deep to 180-190m and fill the box in F-11 (or P-11 for that matter) on a 20mph wind, you won't likely make it with a 4000 mAh pack.

Not trying to be argumentative, but some people read the boards and take things as gospel, and there needs to be some caveat's in place on such comments.