Could be that the neck would seem a good bit more compressed, hot, and dark than the bridge since BKP are known to be very open, uncompressed, and seemingly bright and low output compared to the competition, especially the vintage models.
Dunno about this exact Dimarzio model, but that is my guess. As an alternative to avoid this you could go Abraxxas. Kinda a Mule on steroids. Still vintage, but a bit more all around.