Thanks guys.
I readjusted the deraileur tension while riding it. When the crankset was in double and rear was in say 4-6, I just tightened the front until the rubbing went away. I double checked when in tripple front and 1-4 rear. Sounds and shifts better now, but still gonna swing by the LBS for the hell of it.
BTW what causes the cables to loosen? I've been riding it for 3 weeks or so, every day 10 miles at least, and it's brand new. Just breaking in I assume.