2500 vs. Tau

[nagisaki]

I've never put together a list this big before. On top of that, I've never faced Tau before either. So here's a list of pretty much every model I have right now, let me know what you guys think. It comes out to 2498.

2500 list

HQ:

Hive Tyrant
-Scything Talons
+Stranglethorn Cannon
+Hive Commander
+Armored Shell
-Paroxism
-Leech Essence

Tyrant Guard x2
+Lashwhips

Hive Flyrant
+Brainleech Devourers
+Brainleech devourers
+Old Adversary
+Wings
-Paroxysm
-Leech Essence

Tyranid Prime
+Dual Boneswords
+Regen


Elite:

Hive Guard x3

Venomthrope x2

Zoanthrope x2


Troops:

Warriors x5
+Deathspitter x4
+Barbed Strangler

Genestealers x10
+Toxin Sacs

Termagants x12
+Devourers

Tervigon
+Crushing Claws
+Catalyst
+Adrenal Glands
+Toxin Sacs
+Regeneration

Hormagaunts x20
+Toxin Sacs


Fast Attack:

Raveners x3
+Rending Claws

Gargole Brood x14
Toxin Sacs


Heavy Support:

Trygon
+Regen
+Prime

So the plan is to walk the armored Tyrant up the board behind the Horms and Venomthropes, with Zoans and Hive Guard acting as support. Warriors will outflank with the Prime thanks to Hive commander. Flyrant stays behind the Gargoyles and makes everyone's day sad, and Trygon Prime backs up the Raveners to hit hard targets like crisis suits. Terv and gants will babysit the backfield, and 'Stealers outflank too.

I'm expecting gunline Tau, with some tanks, and Crisis suits. So, barring the old unexpected factors, is this doomed to failure, or a plausible strategy? Also, I'm considering rolling new powers for the Zoans, which I've never done before. I think the suggested rout is Biomancy for Endurance or Iron Arm.. thoughts?