The problem is lack of leadership on CB3s part.
It's my admittedly inexpert opinion that they listen to all the nonsense feedback, and ignore all the sensible feedback.
It's a simple question of 'probability' and 'player feedback'
They want it to be an ARR level atma string-out, while deceiving you that it's not.
Lower the number of atma needed, but also lower the drop rate.
They should have been honest.
They should have required more atma, and increased the drop rate.
That way you have feedback that you are making progress.
It's basic psychology that every child understands from when they went to visit grandma, who always had candies waiting, unlike mean mom and dad.