A good rule of thumb is taking as few upgrades as possible. Your units are very very squshy so more bodies are optimal.
Brainleech worms, wings and electroshock grubs is all you need on your flyrant.
Stick with the basic termigaunts. Spike rifles are sub-par.
I find upgradless Hormigaunts to be fine.
Skyswarm rippes are not worth their points.
You are lacking synapse, so I would reccomend adding a tervigon. Additionally, you could just make a 30 man squad of termiguants to make it scoring!
TL
R
More Flyrants (Best unit in the codex)
Tervigon is reliable synapse
The fewer upgrades the better.