I normally keep my Telecaster's neck pickup high. How high? High enough that it's the 24th fret. You know, just in case you need that extra push over the cliff. It's just a great and wonderful thing.
But you know what? The magnetism really screws things up when you try to do the Eklundh harmonics thing.
I've screwed the neck pickup all the way down, and most of the 4th fret harmonics are chiming now.
Now I'm considering Esquires. I'm considering EMGs. I'm considering Lace Sensors. Anything to cut the magnetic interference. And allow me to fret on the neck pickup again.