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This place needs more bug-lists:

++ Patrol Detachment 0CP (Tyranids) [34 PL, 672pts] ++
Hive Fleet: Kronos
+ HQ +
Neurothrope [5 PL, 95pts]: Power: Symbiostorm, Resonance Barb, Warlord

+ Troops +
10x Termagants [3 PL, 50pts]
10x Termagants [3 PL, 50pts]

+ Elites +
6x Hive Guard [12 PL, 270pts]
Lictor [2 PL, 37pts]

+ Heavy Support +
Exocrine [9 PL, 170pts]
. Adaptive Physiology: Dermic Symbiosis

++ Battalion Detachment -3CP (Tyranids) [71 PL, 7CP, 1,328pts] ++
Hive Fleet
. Other: Prey-sight, Synaptic Augmentation

+ HQ +
Hive Tyrant [9 PL, 185pts]: Adrenal Glands, Heavy Venom Cannon, Monstrous Rending Claws, Pathogenesis, Power: Onslaught, Power: Paroxysm, Toxin Sacs
The Swarmlord [14 PL, 240pts]: Power: Catalyst, Power: Onslaught

+ Troops +
10x Hormagaunts [3 PL, 60pts]
10x Hormagaunts [3 PL, 60pts]
3x Ripper Swarms [2 PL, 36pts]
3x Tyranid Warriors: Lash Whip and Bonesword, Scything Talons [4 PL, 60pts]
3x Tyranid Warriors: Lash Whip and Bonesword, Scything Talons [4 PL, 60pts]
3x Tyranid Warriors: Lash Whip and Bonesword, Scything Talons [4 PL, 60pts]

+ Elites +
Lictor [2 PL, 37pts]

+ Fast Attack +
Dimachaeron [12 PL, 255pts]

+ Heavy Support +
Barbed Hierodule [14 PL, 275pts]

. Adaptive Physiology: Dermic Symbiosis

++ Total: [105 PL, 7CP, 2,000pts] ++

All for a semi-competitive setting, but not totally honed yet.

I've tried similar.
Of the custom fleets I've found that prey sight works best with metamorphic regrowth if your playing Big bugs.