There is a chance to get it on 900 but not lower. And how do you know you got it on 550? Just by looking at Hashirama frags or what? Well that is not correct then.

You get Hashirama frags on every 60 pulls if im not wrong. But as i see you counted 2 frags per 60 pulls and that is not correct. Every 60 pulls you can get one or two hashirama frags. So its not always 2 frags and you have a lot more then 550 pulls in gnw treasure :)