I understand the tought that having more base damage balances it out (and yes for the kromer and ahab fights it does) but with specifically kim (and im not even talking about the hard version of all the bosses) and likely with (presumably) harder fights that could be added in the future it really doesn´t.
But at the end of the day balancing caracthers isn´t as important as resolving bugs and adding new content. So just keep this tought at the back of your head and tackle it when you feel that the time is right.