One of the downsides to hit/damage being mostly abstracted into one roll is that a huge spinal-mount doom cannon that rolls 40 dice is just as effective at hitting a fly spec squad of fighters as it is at hitting capital ships.
It makes it sort of hard to draw a line between an anti-fighter weapon and an anti-ship weapon.
The way I'm thinking of handling this is to make it so no weapon can target fighters that's over a certain ORAT (Before you add arcs, and with 0 thrust).