Yeah, deep strike and Outflank are good ways to get threat overload. I personally like Mawloc, and Trygon Prime lets you deep strike Synapse.
That lets you use things like Ravagers and Hive Commander'd outflanking Broods of gaunts. That puts a lot of threats in the backfield. Let Big Wormey, or your Mawloc have a little talk with the artillery, and you will be on the way to victory.
I love Genestealers, but they are still kinda over priced

So plain vanilla gaunts are your best bet for Troops. Tervigons are still good, but they got a serious price raise, so while one is still a good add in, more than one is hard to justify...
Automatically Appended Next Post: Ok, I had a chance to look at you horde of figs, and use a pencil and paper...
A suggested list, based on what you have...
HQ: Winged Dakka'rant 230
Troops: Termigants x 30 120
Troops: Termigants x20 80
Troops Hormigaunts x15 75
Troops: Tervigon, Thorax Hive 205
Elites: Hive Guard x2 110
Elites: Lictor Brood x2 100
Elites: Venothrope 45
Fast: Gargoyles x10 60
Fast: Crone 155
Heavy: Tyrgon Prime 230
Heavy: Mawloc 140
Heavy: Dakafexen x2 300
Total cost 1850
This not a super list, but it is a winnable one, personaly I'd replace the Hive Guard with Zoeys (and save 10 pts)( and buy an upgrade)
A second Winged Dakka'rant is a easy choice, though its Not easy to see what to take out...

Dropping down a Brood of gaunts and getting Hive Commander looks like an easy move that helps put pressure on the other side's backfield. (I'd likely use the x30 Brood to Outflank myself...)
Then deepstrike the Tyrgon Prime, set a tunnel marker, Mawloc the heck out of something and create enough chaos to run your main force down the field intact.