First off, welcome; always nice to see our CWE cousins coming over to the true kin.
On to the list:
Be informed that some people find it quibbling to take a lamaean as mandatory HQ
Razorwings are very good, watch out for the fact that 2x shatterfield 2x monoscythe will force you to remove models before placing the blast of the second weapon (as per 7th edition changes to weapon order et al), also, I find that the cannon upgrade usually isnt worth it as they tend to get shot out of the sky after dropping 4 pieplates, but YMMV on this (also swapping them for Dark Lances might allow you some redundancy in AT in case your scourges fail).
The reavers; drop the heat lances, you'll most likely be jinking with them, the caltrops are very good though!
Also, if you are in need of some objective grabbing, consider a unit of eldar jetbikes, I find my opponents tend to ignore them most of the time and those objective points can really add up
I am not familiar with the ETC rules, so I cannot give you pointers on that, but this list looks quite scary; where are you going to put the Autarch?
_________________
Sadistic space elves on drugs using poisoned whips and flying around in Jabba the Hutt slave barges... What's not to like?