I tended to use mass Lings and Queens. I saved a couple times through.. I remember the slightly tough part were the last two Scourge Nests. The Lings I'd use to deal the damage and Queens to heal Kerrigan, provide backup support, and spread creep fast. I used Kerrigan's Baneling Spawn and Kinetic Blast to take out Tanks, Firebats, etc.
Keep a good number of Spines and Spores at your base, too. And don't forget to always make macro Hatches.