There's a sneaky gotcha I found in the Rules Reference on p. 4:
- A ship cannot resolve the same command more than once per round.
- A ship can spend both a command dial and a command token to combine their effects.
So if you have a Concentrate Fire token from earlier and a CF order on your dial, you can't spend them separately on two different attacks. If you want to use both, they have to be on the same shot.
(Also: you don't spend a CF dial to add an attack die until after you've rolled the original dice.)