I was thinking about this while I ate Breakfast....
"Endless Tunnel Assault IV(?)
HQ: Winged Tyrant, I run a "Winged assasain" with Lash, Bone, and Toxic. Most everyone else on earth runs 2x
TL Brain leeches 230 either way
I add upgrades to the Asassain as I go...
Troops: Warrior Brood (x3) Deathspitters x2, Rending claws x2, Cannon 120
Troops: Warriors as above 120
Trygon: Prime 230
Trygon: Prime 230
Total: 850
Endless Swarm (585)
Warrior Brood: as above 120
Hormigaunt Brood x15, x3 225
Spinegaunt/Termigant Brood x15, x3 180
Total 1435. I'd toss in a Venothrope for 45, drop 1 Hormy, and upgrade my assasain with Brain leeches, and a Thorax Hive =1500
If you run the Winged Dakka'rant you could buy a Miasma Cannon instead.....
You set the Hormies in a triangle with the point towards you, and put the Veno, and Warriors in the middle, they run each turn till you close.
This forces your enemy to make one of two foolish choices.
1) Pour fire into the Hormies till they are gone. This even matches the fluff for Hormigaunts

While this is happening you can manuever your army at will.
2) Get charged by
CC bugs , with support. This is even more foolish than one. Use the Strangle cannon to try for pin tests, so the lack of grenades becomes meaningless. The Veno can even pile in, and use it's 2+ poison attacks
Each time you lose a brood, it pops up in Reserve, on a 4+. Hopefully by the time that happens, you'll have a well placed Trygon tunnel in place.