40K Army: Tau
Being only relatively new to Wargaming (Only played since March and have about 1000pts of Tau and 1000pts of Necrons) I haven't had much in the way of psykers. Infact the closest I have is the crypteks. So when my friend offered me the chance to use some of his Eldar units in a match I decided to buy Eldrad Ulthran and give it a go with my Tau. The list looks like this

HQ
Shas'el - Flamer, TL Missile Pod
HQ (Allies)
Eldrad Ulthran

Troop
10x Firewarriors (1 upgraded to Shas'ui with Markerlight)
10x Firewarriors (1 upgraded to Shas'ui with Markerlight)
10x Kroot
Troop (Allies)
5 Pathfinders

Fast Attack (Allies)
5 Warpspyders (1 Upgraded to Exarch with Power Blades and extra deathspinner)

Heavy
Broadside Team Leader - Multitracker, Shield Drone
Broadside Team Leader - Multitracker, Shield Drone
Hammer Head Gunship

I was teamed with a Tyranid (2 zoanthropes, warriors, genestealers, dakkafex, gargoyles and hormagaunts) player vs a Blood Angels player (with the battle of blackreach set, a baal predator, and a squad of assault marines), Orks Player (other have of blackreach set, a battle wagon, a handful of lootas and a painboy with his nobz) and a small demon force (Herald, 10 demonettes and 10Bloodletters)

Now apart from abysmal rolls we managed to scrap a win (rail guns took 3 rounds to sink the predator, and having terrible rounds with the firewarriors) the saving grace was Eldrad. I rolled divination and ended up with misfortune, the primaris power and the one that lets you fire overwatch at full bs. Before the rerolls I had 2 hits in rapid fire, after rolling rerolls on my firewarrior squad combined with his squad having to reroll successful saving throws, I wiped the full assault squad out in one round.

Anyway to the question. Next weekend its me and the ork player vs the nids/demons and blood angels and i could do with some advise to tune my army. The list will be mostly the same, though I expect the nid player will drop the zoanthropes and pick up a flyrant, and maybe another 'fex, but more likely 3 Tyrant guards.

I'm looking at dropping the Hammerhead and I would like to field some Striking scorpions, but i'm open to all suggestions.

Sorry for the wall of text.