I know he's not a strong card, but what about the All Out Charge SS Goku? He's weak but his passive is +2 Ki, and he supers nearly 100% of the time.
And yes, I'd dokkan your SSJ3 Goku. He's still really strong those first few turns with your SV lead and all his other links. And his Super lowers DEF which is nice. AND he's a Fierce Battle guy.
Thanks for the input!