So I have a vassal game coming up, a 2v2, I'm paired with BewareOfTom and his Grey Knights, we're facing 2 marines, and I needed to come up with a list, just a quick note on the first Fireknife Squad I'm debating whether to bring a Multi-Tracker or Targeting Array.

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2000 Pts - Tau Empire Army Vel'ka
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Commander Shas'o (HQ)
Independent Character; XV8 Crisis Suit; Jetpack;
Acute Senses; Deep Strike; Recoil Absorption;
Missile Pod; Plasma Rifle; Multi-Tracker

Bodyguard Shas'vre
Cyclic Ion Blaster; Target Lock; Targeting Array
Stimulant Injector Model gains Feel no Pain ability.

Fireknife Squadron 1 ()
XV8 Crisis Suit; Jetpack; Acute Senses; Deep
Strike; Recoil Absorption; Missile Pod; Plasma
Rifle; Targeting Array
Crisis Battlesuit
XV8 Crisis Suit; Jetpack; Acute Senses; Deep
Strike; Recoil Absorption; Missile Pod; Plasma
Rifle; Targeting Array
Crisis Battlesuit
XV8 Crisis Suit; Jetpack; Acute Senses; Deep
Strike; Recoil Absorption; Missile Pod; Plasma
Rifle; Targeting Array

Fireknife Squadron 2 ()
XV8 Crisis Suit; Jetpack; Acute Senses; Deep
Strike; Recoil Absorption; Missile Pod; Plasma
Rifle; Multi-Tracker
Crisis Battlesuit
XV8 Crisis Suit; Jetpack; Acute Senses; Deep
Strike; Recoil Absorption; Missile Pod; Plasma
Rifle; Multi-Tracker
Crisis Battlesuit
XV8 Crisis Suit; Jetpack; Acute Senses; Deep
Strike; Recoil Absorption; Missile Pod; Plasma
Rifle; Multi-Tracker

Deathrain Squadron ()
XV8 Crisis Suit; Jetpack; Acute Senses; Deep
Strike; Recoil Absorption; TL Missile Pod;
Targeting Array
Crisis Battlesuit
XV8 Crisis Suit; Jetpack; Acute Senses; Deep
Strike; Recoil Absorption; TL Missile Pod;
Targeting Array
Crisis Battlesuit
XV8 Crisis Suit; Jetpack; Acute Senses; Deep
Strike; Recoil Absorption; TL Missile Pod;
Targeting Array

Fire Warrior Team
Pulse Rifle (x8)

Fire Warrior Team
Pulse Rifle (x8)

Fire Warrior Team
Pulse Rifle (x8)

Kroot Carnivore Squad (Troops)
Fieldcraft; Infiltrate (if no krootox); Kroot
Rifle (x19)
Shaper
Kroot Rifle
Kroot Hounds
Fieldcraft; Infiltrate.

Pathfinder Team
Scouts; Pulse Carbine & Markerlight (x6)
Devilfish
Tank; Skimmer; Transport 12 models; Landing Gear;
Disruption Pod; Marker Beacon; Burst Cannon
Mounted Gun Drones
Jetpack; TL Pulse Carbine

Pathfinder Team
Scouts; Pulse Carbine & Markerlight (x1); Rail
Rifle & Target Lock (x3)
Devilfish
Tank; Skimmer; Transport 12 models; Landing Gear;
Disruption Pod; Marker Beacon; Burst Cannon
Mounted Gun Drones
Jetpack; TL Pulse Carbine

Hammerhead Gunship
Tank; Skimmer; Landing Gear; #Targeting Array;
Disruption Pod; Railgun; Burst Cannon (x2)

Hammerhead Gunship
Tank; Skimmer; Landing Gear; #Targeting Array;
Disruption Pod; Ion Cannon; Burst Cannon (x2)

Broadside Battlesuit Team
XV88 Broadside Suit; Acute Senses; Recoil
Absorption; Smart Missile System; TL Railgun;
Advanced Stabilization System
Broadside Battlesuit
XV88 Broadside Suit; Acute Senses; Recoil
Absorption; Smart Missile System; TL Railgun;
Advanced Stabilization System
Broadside Battlesuit
XV88 Broadside Suit; Acute Senses; Recoil
Absorption; Smart Missile System; TL Railgun;
Advanced Stabilization System

Option Footnotes:
Advanced Stabilization Syste May use Slow and Purposeful.

Total Army Cost: 1999

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Armies:
Tau | 207pt |

first, Shas'o and bodyguard...
Shas'el, TA, PR, MP, HW-MT
Sha'vre, TA, PR, MP, HW-MT
a little more effective. Sry, I won't use the high detail format you posted with.

On the fire fireknife squad, MT over TA. Bs4 fireknives are known as sha'el and expensive bodyguards.
I have no problems with your firewarriors or other bsuits squads.

But the kroot squad, no need for a shaper, no need for it to be a big blob. Separate it. I don't know how many hounds you got in there.
Why separate it? They are fodder that actually hurt if he doesn't bother with them. Anything he dedicated to shooting or assaulting them should wipe enough out to make them worthless when it is a big blob. Houds adds more teeths to the assault part.

Now, the pathfinders with rail rifles... I don't see the point personally, but perhaps you do. Points could go to upgrade the bodyguard to a shas'el like the first commander or perhaps a few shield drones and team leaders here and there.

The broadside squad... it screams team leader and hard wired target lock. Split those 3 str 10 ap1 shots over a rhino and a pesky land raider.

my 2 cents