for the cob tone u want get painkillers or an alnico nailbomb, they work well in an alder V in my experience of using them in my ESP SV which is similar to your jackson. Painkillers are partiularly good for downtuned drop C and below. Don't underestimate the tightness of the alnico nailbomb, sounds huge and bassy. I would avoid the cbomb because the emg hz u have is already a dry pickup (although well balanced in it's EQ). You will find the Cbomb to be drier, bassier, less mids and much more trebly and slightly thinner in the lead notes/ upper register.
If you use a boost, you can't go wrong with a holy diver either in that guitar. I currently have some painkillers calibrated set in my ESP in drop C, i should really put some clips up for you! snowed under at the moment tho! :D My comments above are reliable cos ive had all these pickups including the HZ.
