Character Card System

I'm still kind of confused on how the +damage effects work. Right now I have two triple S sets, [Buccaneer, Angelic Burster, Cannoneer] and [Paladin, Hayato, Demon Slayer]. The second set grants a "8% HP to damage"conversion, is that really useful or should I trade one of those cards for my Kanna S card and get the 3% bossing damage with no warrior bonus? If so, which one should I take off the set, the Paladin one with the <I-don't-understand> damage effect?

paladin card: grab the bonus the paladin says it gives
multiply it by the level of the character you're currently playing
add it to your range
that is your new -range-

8%hp to damage conversion: find your base HP
find out what 8% of it is.
substract it from your range (if you have the set active that is)
calculate how much damage you'll do on the monster you want to kill (i.e. pdr, crit chances, skill multipliers, calculate all that)
add the two numbers together.
that is your new -damage-

bucc card works the same way.

to put it into perspective, how useful the 8% hp to thing is. i have a base hp of 30150 after washing so much. 8% of that is 2412, impale hits six times. so every impale i cast, i deal 14472 extra damage.