You're talking about a humbucking, bridge p'up isn't it Frank? If you do the same thing with the neck p'up, it gets muddy and overpowers the bridge p'up, especially in 24.75"-scaled, 22-fretters like a Les Paul.
As a rule of thumb, IME, the bridge p'up gets its "sweet spot" somewhere between 2.2mm and 2.8mm. Taking that as a starting point, just to balance the output, the neck p'up (in the case of a set like the '59) balance out somewhere between 3.2mm and 4.0mm. From that point then you look for the "sweet spot" as well. It's easier to avoid the "muddy neck" syndrome on 25.5"-scaled guitars and even easier on 24-fretters.
In guitar setup, there's no "one-size-fits-all" setting.
Maybe all well-known setup concepts don't apply to Fluences because of the technology behind'em? As long as I can't find'em in my country, I wouldn't known for sure.
HTH,