My personal favorite for dealing with GGDAC and any Droids following him around is this squad right here:
http://www.bloomilk.com/Squads/ViewSqua ... adID=16478Alternately, you can drop Han Smuggler and Jaina to run Han Galactic Hero and an Ugo instead. Dodonna helps you keep from being TOO out-activated (though this is still tough against a San Hill/GGDAC squad). Good positioning with Kyle will keep your opponent from using an IG Lancer Droid to Strafe you. In addition, Kyle's Riposte (like Madman pointed out) is incredibly useful against the Lancer. Against the IG-86 Droids, you use Mara's Stealth to help her advance, and then use Luke Force Spirit with Kyle to give him Mettle on his Evade Rolls.
I've also looked at running a version of the squad that uses Shado Vao instead of Han/Jaina, because with MOTF 2, Shado can do Riposte AND Precision together. Then if you pair Kyle and Shado, they can Riposte for a total of 50 damage, killing any Lancer instantly (well, pending semi-decent rolling). Shado also makes a pretty decent piece for leading the charge against IG-86's as well, if you pair him with Luke FS, since he will get Evade, plus 2 FP re-rolls with Mettle.
I've had great success with the squad in the link above, and have beat a couple of GGDAC squads with it, as well as a Mando squad, and a couple others (can't remember exactly off the top of my head). I did run it with Han GH though, and it is undefeated so far.