Hey man, glad to see another fan of ethreals! Seem to be a dying breed nowadays
What weapons do you hammerheads have? Rail guns or ion cannons? If rail guns get submunitions rounds for hordes. I think 2 hammerheads is a bit much though at 1000 points, can't see you coming across enough av14 to warrant 2
str 10 shots. Also get disruption pods on your hammerheads, moving up to 6' a turn for a 4+ jink save is amaze balls. I would drop the velocity tracker on you riptide and give it ion. Keep velocity as intercepting pie plates on deepstrikers and pods is also amaze balls. With the points from these changes you can get yourself a basic
adl for 50pts, put some missle drones in the broadsides, also give your broadsides missles and a velocity tracker. That way they are awesome anti air with 12
str 7 intercepting shots, and you can still fire your smart missles as something else next turn. Put your ethreal in the broadsides, behind the
adl with a fire warrior squad on each side for pulse bubble and away you go.