I hate to be predictable here, but maybe a War Pig would have suited you better, if you wanted more chug. Maybe a miracle man.
I can easily imagine this was another case of a bunch of internet superhero know-it-all tw@t-bags that have never even been within 5 miles of a BKP recommending our 17-year old friend here an Aftermath because it's "best 4 teh djentz" and whatnot. On this forum, people are really good at advising people on what they think will be best for them, because you lot actually listen to what the guys coming here for advice are saying in the first place. On lots of other forums, however, the opposite seems to be the case. It doesn't help either that this whole progressive metalcore movement and scene is a little too fashion- and trend-driven for it's own good. That a certain way of dressing or doing your hair is de rigeur and popular I can live with, but everyone wanting AxeFX's and BKP's and whatever just because it's trendy is just silly.
To the clip, I will say that I actually think the bridge pickup tone is quite good, considering it's done through an amp as utterly hopeless as a Valveking. But I completely agree the Neck sounds REALLY weird. It may be defective, it may be wired up wrong, I don't know. But let me just say, that no human is perfect. BKP's are handmade, so while I've never ever heard of it happening up until now, it CAN happen that a pickup is defective. That said, so-called "professional" techs can make mistakes too, trust me!
For instance, when I changed the C-pig in Madsakre's trusty RGD320 to a Painkiller, I found the most ridiculously obtuse crow's nest of wires I have EVER seen, and the whole installation was done in such a head-scratchingly backwards sort of way I nearly wept at the fact that Mads had actually PAID someone to make such an abject mess out of his guitar. And that was done in one the most well-established stores in Scandinavia!