Do your Hive Tyrants have Wings? A Hive Tyrant with wings, 2x Devourers with Brainleech Worms, and Electroshock Grubs is definitely the best unit in the codex. If you're going to spend money, spend money on wings for the Tyrants
If you want to win, this is what I would take at 1,500:
Hive Fleet Detachment
HQ
Hive Tyrant 240
-Wings, 2x
TL Devourer with Brainleech Worms, Electroshock Grubs
Hive Tyrant 240
-Wings, 2x
TL Devourer with Brainleech Worms, Electroshock Grubs
Hive Tyrant 240
-Wings, 2x
TL Devourer with Brainleech Worms, Electroshock Grubs
Troops
Mucolid 15
Mucolid 15
3 Ripper Swarms 45
-Deep Strike
Elites
1 Venomthrope 45
1 Venomthrope 45
1 Lictor 50
1 Lictor 50
Heavy
Mawloc 140
Mawloc 140
Carnifex 150
-2x
TL Devourer with Brainleech Worms
Tyrannocyte 75
1,490
Spend the last 10 points as you wish. The general plan is deploy the Flyrants in flying mode around the Venomthropes for a tasty 2+ jink. Also deploy the Mucolids out of sight. They can infiltrate onto objectives if needed. The Lictors can either infiltrate or deep strike depending on the board, but the key is that they go where you want the Mawlocs and Canifex to deep strike. You can deep strike some Flyrants if necessary.
I know this list doesn't look that fun to play, but it's definitely strong and is something that could do reasonably well at tournaments.