I've never faced corran/dash. But I'd treat it the way I treat corran/falcon builds. Pressure dash and stay out of range one of Corran. I'd like to kill Corran first, but that just is not realistic usually.
It is usually a challenge to kill Corran first. If you can manage to get him in both arcs in one round you can probably pop him; even getting him in arc of one ship on consecutive rounds might be enough (depending on how Corran is loaded out). Corran without PTL is much more fragile than a Corran who can turtle up with a focus and evade.
The other thing to consider is that Dash is probably worth more points as well as being a squishier target. If you can drop him without losing an Aggressor - no easy feat with Corran nipping at your heels, I admit - you are sort of in the driver's seat as even if you do eventually lose an Aggressor, you should still be up on points (enough for a modified win, at least).