I target Dooku teams when I find them, and my squad isn't too far from yours—I run Wiggs, StHan, R2, DN.
1. R2 goes first. If I go stealth, than anyone else can chip away at Dooku without fear of counters. That'll also let R2 try a stun on him next turn if I want.
2. After R2, Biggs gets a shot. I can usually one-shot him (cd/cc sets) if I want to, though I usually choose someone else because . . .
3. StHan gets a taunt off. From then on, Dooku is my best friend. All those counters feed tons of turn meter to the rest of my team. At some point near the end, I can one-shot him with Wiggs or annihilate him with DN if he's got crit immunity and there's no better target (like a Zavage).
So I guess the takeaways are try R2, get Wiggs's damage up, and get these four to go fast. As soon as StHan taunts, Dooku hurts the opponent more than anything.