Haha, thanks for all, this is some lovely feedback.
I think it's a bit of all really, the amps, the cab/speakers, guitar, cable, pickups and being lucky to find the right combination of settings and mic position ... ah and the attitude of the player for sure :o)
Philly to be fair, I had some pretty decent Korean pickups in my PRS SE when it came stock, but they weren't even close to the VHIIs I put in after. I think the impact of BKPs on the end result is huge!
Guess crawlers are not for me, I'm really after bite in a bridge pickup, it's gotta drive the top end of my amp and be rather tight in the bottom. However I do love the Black Dogs and they are a bit darker ...
Looking forward to feedback about your crawler, and yes, it was a loop from the BrutalBeatz compilation.