5Atk 3All or 7 atk scrolls on fafnir weapon?

Better to be 100% sure about diligence not working, rather than unnecessarily waste Lucky Day scrolls on something that is already at a 100% chance of success. Plus, I was asking about the 20% scrolls, because I've always wondered if it really had an effect them, or if I was just under the illusion of it working for me.

I would rather use a lucky day for the one character i have with max diligence than fail just because i was uninformed. :/ Not sure how many characters on separate accounts you have with max dili.