The Arrow Of Harming doesn't deal more damage than the other arrows.

The Arrow Of Harming deals only 1 heart more damage than normal arrows, try making it inflict more damage or have the potion damage be inflicted 1 second AFTER hitting a mob or player, so it's not trying to damage the mob in the time were it can't take damage. (I feel it should deal either 10 damage or 17 damage, because those are the damages of a fully drawn bow with a splash potion of harming 1 and a spash potion of harming 2.) (Its just more logical for it to deal more damage because it is a Arrow with the harming effect)