I played the new Combustion in church this morning, it was my first time using it live since I got it a few days ago. I know I'm preaching to the choir here but DAMN it was awesome! It sounded so full in the mix and even up and down the neck. I can tell this is the start of something really great, I'm super excited about this bass.
I used what I'm calling the "superP" setting which is position 2 on the 6 position rotary. It's the neck and middle pickup together in series with the neck coil switch in series and the middle coil switch in parallel. I dialed l back the passive tone about 40%, preamp was on with a small bass boost and mid/treble just above the center detent. It's a really thick but detailed sound, not overbearing and still has a bit of the P bass mid grind to help give it definition in the mix.
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This looks exactly like what I was wanting! Inspired to borrow your idea and take it to my tech, now.

