Maybe it's better to put that Dual on Dor. He is blocked several times a battle by Primus as his Penetration is very low additionally his first overcharged hit sometimes is not critical. Caro has high enough Penetration for unblocked hits and with Dor most rounds auto-crit. Only the rounds after Dor died she does normal hits sometimes so it depends on the frequency to find out which setup is better.
I put the various damage results in the post with the video so you can compare your results per commander.
I can't tell. I am really satisfied with the recent results and I think you have to watch several battles with Louise to get a feeling how her special interacts with the fleet especially over the course of several rounds. And as I don't own her I don't have this feeing for her. Maybe I will give Cryptor a try to replace Ursa. If this gives more rounds reliably the overall damage might be higher.