Gotta agree, you're always hearing about khornate artillery in the fluff so might as well represent in game. So I say leave hellfires as is, as even in a unit of 8 400pts isn't that big a deal (at least in my eyes) and maybe even add some decimators for more daemonic artillery goodness
I agree in making the zerkers the same as the BL list, for continuity and simplicitys sake
As for the blood rage/lust why not just make them initiative 1+ or even 2+ wtih a +1 modifier to engage/rally actions? So as to represent their craziness (though not to the same mindless degree as nids)if you want to encourage it or go like scarik said initiative 1+ and done.
As for the daemon assault engines I'd drop them to 600pts if we're going to keep them at 8 as 650 brings them into leman russ company territory and I know which one I'd take. Either that or make them 4-8 at 75pts each
Change rhino's upgrage to up to 4 rhinos at 10pts each (ala 1k sons)and make them bog standard rhino's
Make armoured companies between 4-8 pred's/land raiders and drop the CC4+ and then some points as well
and lastly change the support formations to either 2 or 3 per core as this is what most other lists use, 1:1 is just too restrictive
/rant
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