DP hate screams, especially in contact with OTS.
Purp sun is cheese I always prefer shadow. The Remains in Play will help you control the magic phase. Hes going to try and fly over to your line and purp sun on turn 1, so be the better man and beat him without it.
What I'd have brought was a BK bus with flaming banner with blender + mini blender. Lots of wolves/zombies/spirits to dictate how the fight goes. Probably fly a Tgheist to take out the hellcannon asap, while slamming into chimera and melting them hard.
Throgg has to challenge, accept with champion. Then he can only puke on one guy. Then your vamps melt most of the trolls, thy are fleeing for sure. If for some sad reason you get hit on the flank, you can make way with your vamps and still win almost any combat.
For vampire you want a standard Ogre Blade, OTS, ASF, RF. The game is won with your lord so you don't want to skimp out on points for him. You need to melt things before they can react.
In this list, even with an annoying dragonhelm DP you can get in contact then scream at him and very often thats it for him.
With so much regen, hexwraiths are fun especially with BK bus who can keep up with them. Not a lot of magic to stop them. Throggs puke is not magical. If you can pin down the DP all your ethereal units can pretty much have a field day. A single SH can hold down a chimera, skullcrusher or any (non-demon) char without magical weapons for the entire game. Bring a ton of SH, Banshee and cairn wraith with BSB and Morghast and you can nearly paralyze their entire army.