Chuckles comments are good as ever. I would like to add another dimension, which is you are vulnerable to fliers, and there are many more of them around. I accept that you might manage to take them down with Zoanthropes, but it is literally hit and miss with these guys against fliers.
Another way to develop the list is to take two sets of twin linked brain leach worms on the hive tyrant. This gives you a much more reliable way of hitting fliers, but you have to pay for them. In your list I would either do that by dropping 4 Hormagaunts, would you really miss 4 in 60, or switching to two squads of Hive Guards and one squad of Zoanthropes rather than the other way round.
Best of Luck.