Calculating %increase from boss neb + other calculations/questions

Dual Blade doesn't have any %damage that affects damage range, but they get 60% from Final Cut. I had 10% from Kanna, however much is on Hero's Gloves (20%?), 9% on my Dagger, 9% on Katara. All that + another 10% from Demon Avenger now.

Also, I'm about 90% sure Ambition doesn't work.