[1.2.337] Royal Hairpin

Besides the differences between a w.att helm and a non w.att helm, you really only have a 27.27% chance of a chaos scroll working in your favor to increase a stat.

So it's like 60 ( 5 / 11 ) = X%

Because you have to gamble on the 60% chance + the chance of getting each result from -5 to 0 to +5

Even if you wanted to get the best stats for it, the chances of succeeding a +5 on a chaos scroll is 5.45%^9slots at most.