Put one Flinger at the very top of the catwalk under the Dragon. Have you team stand there and put another flinger on the other side of you. It goes through the Nova ninjas like butter. When one does occasionally get through... have one or two guys with Knucks or Bowies and finish them off.
Also... If you face a Flinger to a window(the one next to the NAV card table)... It will hold it down for a couple rounds before breaking down. Makes holding the rooftop very nice until the high 20's, low 30's Then it's Train/Sliquifier time.
And a Flinger at the very top of the dragon catwalk with do nice work for you for a couple rounds as well.
If any of this has been posted I apologize... I looked but didn't see anything.