Thanks for posting this update.
Between your Clement, torqueflite's CB, and Cliff Bordwell's own praise of the Bigman, I am seriously looking at one for my upcoming custom CB. I'm not usually happy with single pickup basses in the long run, and tend to run my Curbow with either 50/50 pickup blend or bridge only, so a setup like yours (switching between the front coil of the Bigman and a matching BS in the neck position) seemed like the perfect way to get the best of both worlds. Very interesting to hear that a 50/50 blend with the BS and the BM rear coil did not give the best results...
What are your impressions of the Bigman soloed, especially with the series/parallel switch?
I'll be doing a P and Bigman with my CB which starts in the next build.