EK+tap thruster can easly outrun NPCs because they don't follow your example (I don't think they do EK...), nor do they CD an EK-ing ship. So they drop behind, going at 80 m/s to your 200.
One exception is Nomad fighters (only), which have some odd ability to keep up. Fortunately, they have no CDs, so you can just cruise up and get away...