Someone had mentioned it in the other thread a few days ago, I tried the harpy + 3 carnifex charge this afternoon. Was pretty devastating having the fex's hit first on the charge.
Tervigon is still useful as well, just pricey for what it is now. The extra mid game spawned gaunts were kind of a big deal with the obj's at the end seeing as my initial wave of gaunts still tends to get pretty dead by Turn 3-4. Was also lucky with psychic. and it makes a good back line babysitter for non gaunt units.
Loving running 18 FB gaunts with 12 Dev in the back of the same unit. protects the dev gaunts for longer, and the unit having 12" range up front and 18" for guys in back seems to make them more reliable about all having range shoot with 30 in the unit.