With the enhanced drives you will want to keep the ship under minimum mass to get the speed cap. For class 3 dirty drag drives that is 60t. The only ship that can still be a functional build at 60t is the Imperial Courier with it's 35t hull mass. Both eagles and the Viper have 50t hull. Drive distributors give you 66t max before speed starts to drop, but they are also a bit slower than drag drives.