Well, Mira doesn't look too bad as a darksider either.
I know he will have a good defense, but without strength he will be doing no damage. What good is lightsaber finesse if he is doing barely any damage.
<{POST_SNAPBACK}>
It doesn't really matter how much damage he does. Give him a couple damge bonus lightsaber crystals/components. Or you could just ignore it since your main character becomes nearly godlike anyway that you'll have no need for any other characters.
Even if he only does 20 or so damage per hit, with two lightsabers he'll be doing 5 hits at 20 damage each for 100 damage per round. With all the loot you get in the game it shouldn't be hard to find something to help.
There is also a lightsaber lens that adds 1-20 damage. Stick one of those in there and he'll be doing just fine.