Ask a Bowman Thread.

I read Quantact's post and saw that not maxing FA will allow for maxing every other skill... Which leads me to ask, is maxing PKB worth it? It gets replaced with dragon breath (I think) which is actually a better normal monster knock-backer. Might as well put that SP into focus and blessing.

Well, that's kind of like saying "Don't max Lucky Seven. It gets replaced by Triple Throw in 4th job."

True, Power Knockback isn't as important as Lucky 7, and you're using it for 20 less levels, but you should still max it if you're not maxing Final Attack.