I will follow part ninja on most. But I don't agree on a few things.
1. No warlock, the primaris change from what read in the french book (might ne some traduction mistake), shrouded only apply to the psyker not the psyker and his unit.
2. You should drop a wraithknight just to avoid being to dirty >< but i guess you could say that it's not a real good reason. But at least i would try changing his equipment like going with sword or suncanon rather than straight double wraithcanon would force your opponents to target priority while the other one is perfectly free. I think. Not sure it would work aswell as i imagine it.
3. I would defenetly put an avatar in this list would be extremely good with your storm guardian. With his new rules that would do wonder.
4.I would take the hornet out for some crimson hunte because with your actual list, out of the saturation of your war walker you srly lack anti-air power in my opinion.
5. More vyper, more falcon. Jokes it's only because i like these units^^. But more srly i think vyper might find themselves some play time on my end seeing how cheap they have become.
There you go, here is my input.