mixing in some hydra, and time the attack at 166.6supply seems to work better for me!
e/ hydra twice the dps, and more ranged
downside = less hitpoints, witch is countered bye the longer range if micro before a-click
downside = cost 50%more minerals but same supply, and require other speed upgrade
witch results in triple the army dps in the first 5seconds of the fight, when only 60%of the army is shooting
shoot in air, so overlords and medivacs or toss-air dies aswell