This Jutsu has been in this game for a long time now. Through out all the time it has been here it has never once been boosted to a standard worthy of it's rank. It is probably one of if not THE slowest projectile based jutsu in this entire game. It's damage doesn't even justify the speed it is given. What I would recommend is you give it a slight damage boost and add a stun effect in tiles around it as it moves on the map so it can at the very least impact a battlefield more than just being a nice sprite to look at as it goes across your screen.