The Warpigs are currently out of my Explorer as I am in the process of completing the shielding and having a full custom harness made and SD Triple Shots fitted, so I can't play it at the moment and I don't want to make a final comment until these changes have been made, but this is what I know so far.
1) With a high-gain amp like my Peavey there is no real clean. The output is so high that even on the 6534+ rhythm channel - the cleanest of the 5150 series amps - the guitar sounds like my Cold Sweat with the tube screamer on as a boost, in other words it always has a warm, slightly overdriven sound. When I have the ability to split the coils on the neck with the Triple Shots I'll let you all know if that improves the cleans, but I would strongly suggest installing a coil tap on the neck pickup at least on a Warpig set.
2) I have no idea why you would want to use this neck pickup with a Holy Diver bridge! I imagine it would be very overbearing. I have not tested it in the same guitar with my Cold Sweat or A-Bomb bridge pickups but the idea never occurred to me. The neck values are lower than the bridge ones in order to compensate for the differences in string vibration. I would think you would be happier with the Rebel Yell neck if the Holy Diver neck does not appeal to you. From what I can tell it is a slightly warmer sounding version of the Cold Sweat neck