After thinking for awhile I think 2 skyrays should be best. The extra pie plate and strength 7 shots are not really needed. The double skyray would give me decent anti air.

I also decided on the skyshield. I can place it half in my depolyment zone and half out. I can infiltrate my kroot on top giving them +4 invulnerable saves. With my broadsides I can move up and snap fire on turn one. Also the platform would give my ethereal a +4 invulnerable.

If I can fit two skyrays on top I can give them +4 invulnerable saves and save on spending 30 points on giving them a cover save.