VLC's record feature worked.
1 shot kills on 2 turrets:
I didn't quite get the 3rd turret before getting killed by a Blackbolt.
Another thing I noticed in one of Close-shave's videos:
At 9:03, you ion a gunship with shield overcharge, doing 970 damage and applying the regen debuff.
Immediately after the hit, the shield indicator says 74, but the shields clearly regenerate over the next few seconds.
Testing whether Shield Overcharge increases shield strength will require a true 1 shot kill.