I have a scum list I particularly enjoy playing. What I affectionately refer to as the D.VA list.
Something to Fear
Kavil is throwing extra dice, he wants something that is actually doing dmg. Blaster turret or dorsal turret. Ion turret for Dace.
Kavil has the Ion Turret for a number of reasons.
Firstly, he is throwing more dice, which means better odds to get the Ion to stick, and better odds of getting Dace's ability to trigger for a point of free damage. 2 Damage + Ion.
Secondly, Dace can trigger his ability at Range 3, but the Ion Turret only reaches out to Range 2. Putting the Turret on Kavil allows Dace to skirt the field, forcing opponents to go out of their way to get to him. This, in turn, exposes them to the rest of the squad.
"Then why have BMST?" one might ask. Well, it's unreliable, so I don't go out of my way to trigger it. But if an enemy closes with me, then they have to risk the potential of suffering direct hull damage.
I agree with Beard; you pay a premium for Kavil's ability, you really want him dealing more damage. I'd give him Dorsal + R4 Agromech + Mindlink for the same price as you are paying now or if you are dedicated to the Ion Turret try Drea with ICT+Unhinged. She is 2 points less than Kavil and seriously accurate with always having a TL and easily shedding the stress from reacquiring.
For 3 points you can give Dace Dengar crew which will make whatever turret you give him more accurate.
2 Points left, you could give Asajj a number of useful illicits: Burnout Slam and Glitterstim come to mind. You could also give the Y-Wing an Ion Bomb.