I thought about the C-Pig, but decided against it as my recommendation because that sound, while in aggressive music, just isnt that aggressive. The C-Pig is very aggressive. You could get a sound near that out of it with suitable amp settings, but it seems to me that the voicing is a bit more restrained and presice. Plus, either decapitated or the AEs they use (similar enough sound on a couple of albums to be the same guy?) really know what they're doing to create their precise sound - there isnt that much gain going on, and every note is crystal clear. Thats much harder to achieve with more gain and hotter pickups, and you really get that ultra-precise metal tone by backing off the output a bit so the length of the wind doesnt start to overcompress or mud things out and easing off the gain on your amp.
The other way of course is actives (I believe that decapitated use EMGs?)
The C-Bomb is quite even eq wise save maybe the top end, tight, powerfull but not nuts, intermediate compression and has a certain smoothness in the top end (that I'd forgive you for calling 'tailed off' or similar, but I dont think it is, its just a little less sharp in its attack) that fits the negation tone well and is capable of relaying anything humanly playable clearly and comprehensibly (which doesnt mean to say that the Cpig will mud out, but its *better* than the c-pig for hyper-precision).
The PK has a huge mid and especially high mid. If you'd said Organic Hallucinosis I'd have said painkiller. Grindier and more open, with more high mid.
I'll check out the other arsis stuff. Rather enjoyed the riffing in the track I heard. I seem to recall dismissing them pretty quickly last I heard them as a generic 'tech' (used too much!!!) death metal that there are a million bands like and most better, but maybe I was hasty...back in a bit.