The biggest issue I see for your army is dealing with horde. The Incubi can certainly do some work, as can the Razorwing missiles, but I'm suspicious that a decent Guard, Nid, or Ork list will see you drowning in bodies before the day is done.
Keeping your general concept, I'd agree with the above poster that maybe some additional Venoms are a good idea (though I'd tend to put Warriors, not Incubi in them to cause more priority targeting issues for your opponent)
Doing a total rework, I'd suggest an all Dissie Ravager (or maybe some Dissies on a Razorwing or two) and reworking your HQ selection would be beneficial.