[jowe01]

Adding negative "to hit" modifiers to the larger mounts already pretty much does the job, especially if you also reduce the ability to compensate for them through combat sensors. CapShips will still carry large mounts because they are still extremely efficient against other large targets (other CapShips, bases and planmets) which have negative defense modifiers. If CapShips nevertheless carry normal mounts, these can be considered "secondary weapons".