The revealed potential thread!

It's a decent potential for C.Vellum (although I find %Ignore on equipment to be unnecessary seeing how 1) Xenon can achieve ~90% multiplicative %Ignore with just skills/links and 2) it's possible to stack up on %Ignore from party skills), but not as an effective potential for other bosses (although it wouldn't really matter since you'd be able to kill them anyway).

 Side note

I think you may have been fed the misconception by your peers that having a large amount of %Boss/%Total whatever is a "bad thing" and therefore it's best to recube your weapon potentials for %ATT, because it's not necessarily true and I believe this sort of thinking can be misleading. It's just that an additional x% Boss (when you have a large amount to begin with) will yield a smaller, diminishing %increase relative to an additional y% ATT (something that you're most likely lacking). The idea is to maintain

 a balanced ratio

where the two "+new" potential lines at legendary (e.g. +40% Boss, vs. +9% ATT) will roughly be equal to one another.

If you feel that the former is too high, then the remedy is to get a fix from bonus potential for the latter. So if I were in your position, I would have just left the "before" potential as it was, and waited to cube the bonus potentials for %ATT.

That was really helpful! Thanks again! I still have the before potential on my whip blade though, so I'll just wait for bonus cubes and miracle time again
Currently 1% Atk is equal 4.6 %boss. I included the Demon Avenger and Kanna link skills into the calculations. (Not sure if it counts towards total damage though)