There's no cooldown on scrolls, only reuse timer, which is shorter than the effects of the scroll last.
The situation was overcrafting by 50 lvls, not the 60 in your situation, so a q50 scroll would make it like you were only overcrafting by 42 levels instead of 50, but still getting xp for the 50.
The situation was overcrafting by 50 lvls, not the 60 in your situation, so a q50 scroll would make it like you were only overcrafting by 42 levels instead of 50, but still getting xp for the 50.