Ballast shipped all the way to Mars

Curiosity depended upon dropping ballast weights to maintain it's attitude during re-entry (entry?) to the Martian atmosphere.  The amount of ballast is surprising.   Two heavier weights were dropped to bring the nose up and allow aerodynamic maneuvering.  Then six more 55 pound ballast weights were dropped to level the craft off.  Six times 55 pounds is 330 pounds of ballast.  That's a lot, considering the entire lander only weighed 1924 pounds. 
   I hate to Monday morning quarterback a successful mission, but you would think they would have used some kind of steering fins sticking out in the airstream.  That's a lot of dead weight to blast all the way to Mars.