So I know this trick probably isn't going to have a very long life span now that the next chapter approved is coming later this summer, but hear me out.
Take a Dark Creed Tantalus, use screaming jets on it. Drop it behind enemy lines and then use the Dark Creed Stratagem to snipe out a character. 3 CP and you have to pay for a tantalus, but has the potential to kill off a daemon prince or Cawl early on. Could even split the fire to take out two IG commanders, the possibilities go on.