Ummm......I don't know. I was going to go with daveplaysbass mod 8. I'm not sure what I want, but for $15 I figure I'll try something. Although the more I'm reading it seems people like the inner coils a little more.
The inner coils are punchier and sound more solid to me. They sound better soloed to me as well.
I don't know how things are with USA G&L wiring and what the "series" setting sounds like, but on L2000/L2500 Tribute basses the series setting hum canceling is fatter and middier than parallel with less treble. The K-mode or OMG mode sounds like a wide and deep single-coil because all of the treble from one coil gets shunted to ground through a .1 mfd capacitor while the other one retains the treble. It's fat and clear, and you can have it go from spanky Jazzish/P-ish with the bass rolled down or up to thunderous with bass full up - all while being clear.
I pulled my preamp and now have separate parallel/inner coil/series switches for each pickup and a pickup selector switch. I replaced my volume pot with a 250k push/pull which, when down, puts the series mode into K-mode and when up it's in hum canceling series mode. This gives me a lot of options and the original look of the bass is retained. What you could do is use a 4PDT on/on/on switch in place of the stock series/parallel switch to give you parallel/inner singles/series, and use a 250k push/pull switch for switching between balanced series and K-mode.
I've got a wiring diagram that I made for this mod if you want. I also just happen to have an extra 250k push/pull switch since the Ebay seller I bought one from ended up sending me two. All you would need is a 4PDT on/on/on switch and I could help you find one of those if you like.