First, you cant post individual point values for units and upgrades

. Just the total price of the unit. Forum rules.
HQ
Eldrad is pretty nasty, and I understand you want to test psychic powers against orders, but he is a HUGE point sink. A cheap guide or doomseer would probably be better, but if you are dead set on testing powers vs orders, It is better to run eldrad than a decked out seer.
Troops
Drop the chainsabers on the scorpion exarch. They are the absolute worst upgrade you can give him, because you lose his anti armor ability. A biting blade costs the same and will shred armor. You should be winning combat no problem against most
IG units, re rolling a few hits and wounds wont matter. Not a huge fan of scorpions, but outflanking and assaulting something they can be quite potent.
Drop the dragons for some war walkers with scatter lasers. These can provide anti armor or anti infantry fire at range and are far more survivable. A pair throws out 16 S6 shots. Re roll with guide, and your doing serious damage.
Dire avengers are solid. I would drop bladestorm, as you probably want to be shooting every turn. Guide+doom should mincemeat any guard unit no problem. Take defend, and give your exarch a shimmershield and power weapon. Shoot as your run up the board and get into assault. You will trash any guard unit in
CC with this unit easy with psychic support.
Give the wraithlord an
eml, and make sure he has dual flamers. He will massacre guard in
CC, as only walkers and powerfists can harm him(and only on a 6), but is unlikely to get there as he will likely be shot down. Having no tanks or other large target, he will catch every autocannon, missile and lascannon your opponent has.
This list should work much better.
HQ
Eldrad-210
Troop
ScorpionsX5. Exarch w/biting blade, shadowstrike-117
AvengersX10. Exarch w/shimmershield&power weapon-147
Heavy
Wraithlord w/dual flamers, Lance,
EML-155
War walkerX2. Dual scatter lasers each-120