This info is accurate to Post-Big Bang
A Bowman will be able to max every skill in their second job book. Final Attack is a very nice skill as it's like a bonus arrow has been shot with no delay. Enhanced Basics combos well with Arrow Blow as it makes it almost as strong as Bomb Arrow. Both skills will be maxed so the order isn't too important. As long as Mastery, Soul Arrow and Bomb Arrow are maxed you shouldn't have problems (I would say Booster also, and I always find it useful, but I know that it's not always the most important skill).