if you have other ways of leveling your gunners faster, sure, having gunners 10 levels higher would make the grind easier.
but if this is your first BB line, I'd say you are fine where you are. Having near ship-level gunners is a good way to learn careful BB play.
Just remember that when your BO gets to lvl 89 and get the Iowa, your gunners would need to be at lvl 91 to use the proper guns.