The raven strike fighter does seem that effective now that it's gone back to it's 200+ points tag. If you're happy to use Eldar allies I think the Nightwing (at the same cost as a standard razorwing) is a much more effective flyer, particularly against other flyers.
Your obvious issue is the fragility of your troops and lack of any anto tank until the flyers come on. The small unit of wyches and warriors will die very quickly with any distraction, while any decent assault unit that makes it to the large warriors will sweep them in a turn.
I suggest you tone back the number of flyers to include some wracks and reavers (or maybe even blasterborn).
Rathstar