@Kobe : for the missiles, I agree that wave 8 desserves a rocket. For me it's the following schedule : 2 missiles wave 5, 1 wave 8 (only if I can get both the Atlas and the Prime at the beginning of the wave), 1 or 2 wave 9 (depending on the opportunities to get the two Atlases and the Banshee together), 1 or 2 wave 10 for cleanup.
However, I'm surprised when you say that phantoms "push" you towards the pyros because, as a vanguard, you're the one who should "push" phantoms, it's not her who should push you. What weapons did you use ?
Otherwise, don't do White Hazard ! The visibility on this map is awful, what is deadly for wave 8 of Cerberus, since pyros are troll spawns specialists and this wave can quickly become an horrible gangbang if you are stuck between pyros and phantoms. Don't hesitate also to use a thermal clip on this wave for some extra grenades, keep your distance with pyros (charge them only when you're sure to kill them, and not when they are grouped), and watch your back and your flank constantly (but you already know that).