Agent Orange knows much more
I've only played mine twice, and haven't taken the time to do any tweaks.
My advice for H3ADLY based on my limited experience would be the following for a Warpig set:
Put a coil split on the neck pickup
Use a parallel/series switch on the bridge
This will give you a broader palette of sounds while retaining a fatter sound on the bridge in parallel mode than you would get with a coil split. On the other hand the coil split on the neck might just clean things up enough to get a decent clean sound on the neck pickup for those times when you need it.
The Miracle Man is something I considered carefully, and I very nearly got them. In the end the sheer overkill of the Warpig was too tempting!
I think you will find that the C-Pig is like a gonzo version of your Aftermath with a heap more bass, some of which you might not find a use for if you find the Aftermath is doing a good job for your band already. The alnico bridge will give you a flavour that you do not have at all with the Aftermath, big, nasty and organic while still tight but nowhere near as dry and tight as the Aftermath.
I got it because the sound I'm trying to get out of this guitar is the fat, juicy Spanish grindcore sound associated with bands like Machetazo, Looking for An Answer, and Nashgul (which all seem to tune down to B), i.e, this kind of thing:
http://www.youtube.com/watch?v=EVHlHJ0CWuUMachetazo look like they are using passives in footage but the pickups look like hot rails. Anyway I got teh A-pigs with that fat death/grind sound in mind. It is closer to the sound of old school death metal like Autopsy than the stuff that you have been doing.
I also wanted it for Electric Wizard style doom. I doubt that the ceramic version could really give that sludgy aspect. If you want to experiment with those kinds of sounds I'd say get the alnico version. If you want to stick with a drier deathcore type sound but just want something deeper sounding and higher output than your Aftermath then go for the ceramic.