Hey Matt,
Welcome to the club.
Specifically referring to your question, a quick look at G00gle images allowed me to grab the small screenshot below from a photo of JN which shows how he had the controls set. Assuming he hadn't moved the knob positions ... it looks like he rolled off the treble on both pickups a bit (marked knobs at 1-o'clock where 3 is wide open) and added a slight Q-boost at the rolloff frequency (pointer knobs at 9-o'clock where 5 is "no boost"). Like my demonstration in the second pic below.
Now having said that, I can assure you that I won't sound anything like Jason with these settings. For one thing because I'm not licensed to operate a pick.

But I'll also add that while it's interesting to see the detailed preferences of various players these things mostly make a difference to the guy playing the bass. He has set it up the way he wants to hear it but that doesn't mean the same settings would be anybody else's choice.
Furthermore, in a live situation his bass was running through a wireless system, then likely had some (or a lot of) processing added at the sound board. I've never heard him live but I'm sure the results of that entire signal chain sounded amazing!
The Series instruments have a very wide tonal response and thus can be shaped into whatever sound pleases you. Plus they feel great to play, are super even up and down the fingerboard, and easy on the eyeballs too!
Keep thinking about it and someday a Series axe will come your way.
Jimmy J