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30% give +3 main stat and +7 att
15% give +4 main stat and +9 att
Primes give +3 all stat and +10 att

Do the rest of the math yourself.

Primes are 40% right? Primes all the way if you can afford it (I think you need to Prot it after every scroll since it got Boom Chance). I tried making some Nub level 20 equips for my Kanna Training and the best i could pass was 1 15%, 2 30% and 5 70% scrolls. Those % are way too harsh unless you want to invest into clean slates/innocence. It gets worse if you try to prime Fafnir stuff since you need like 500+ traces for each slot.