Are you dropping them with or without guidance?
By default GBU release points are calculated a bit long but that's on purpose. That's for ensuring they would hit the target even after maneuvering and bleeding some energy. Now don't quote me on the exact terms here but I remember with the A-10C, in the weapon profiles we would switch to ballistic release point calculation when dropping them unguided. Otherwise they would always land long. As far as I know there is now way to do it currently in the Hornet.