40K Army: Tyranids
Hey guys need a hand. I've got a game with my nids against an all bike marine army tomorrow and I need some advice as I've never played a bike list with my nids.

Mates list looks something like this.

List is
Captain
Relic blade
Storm shield
Bike

Libby
Avenger, null zone
Bike

Command squad
5 Bikes
4 storm shields
3 lightning claws
2 plasma guns
1 thunder hammer
and a partrige on a pair tree

3x bike squads
2x melta gun
Multi melta
Power fist
Full squad 8+ attack bike

3x attack bike squads
2x attack bikes
2x multi meltas

(he will probably also run a techmarine on bike to bolster his home objective)

Now I don't want to tailor my list but I'm not sure which of the two varients bellow will work better.
First one operates on the proviso that he has no real template weapons and if he wants to shoot at my big guys with melta he wont be shooting bolters at the little guys and vice-verse. iut also operates on the concept of force multiplying and turning those gaunts into some fierce little *******s by giving them the right buffs.

Tyrant:
Wings
LW+BS
ST
Parox
Leach

Tyrant
Old Ad
HVC
LW+BS
Parox
Psych Scream

elites:
2x Zoans
2x Zoans

Troops:

15x Terms

Tervigon
catalyst
clusters
toxin

15x Terms

Tervigon
catalyst
clusters
toxin

20x Horms
Toxin

20x Horms
Toxin

Fast attack:

10x Gargoyles
Toxin

Heavy support:

Trygon

Trygon

All up thats 2k points 80+ guants and 32 T6 wounds, seems pretty solid to me especially against an infantry list, mostly I'm only really worried about the command squad as everything else should die just like marines to poison or S6.

So any thoughts?

I could drop down to 60 or so gaunts and take the doom as a distraction/counter Deathstar but I don't think it will be needed here.