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Guitar pickup noise/interference, how to eliminate?

Getting that noise from the guitar where when you touch the strings it stops, but also discovered that it only does it when the guitarist is holding the guitar in the playing position, i.e. the pickup is facing out away from the guitarist. Noticed that when we turn the guitar around so that the back is facing out, the noise stops. We're in a residential finished basement.

Jazz Bass pickup hum

My recording engineer wants me to up-grade my single coil pickups on my Fender Jazz Bass to eliminate the hum.
In reserching the problem, I've found that these two stock single coil pickups should cancel the hum themselves by design.
How do I check the polarity of these pickups to see if they are installed correctly?
Are there any other tips for eliminating the hum?