I finally got around to making the response plots to show the difference in the slant vs. no slant. I thought some of you might find it interesting. Please excuse the image quality as I'm limited to 500 pixels.
Here is the treble E string (slant not effected)
The A string with no slant. Notice sharp nulls in the 1 to 2 kHz range.
The A string with the slant. Notice the region between 1 and 2 kHz scooped out even more. More quack. This scoop out is accomplished by not only by the spacing, but the slightly reduced relative amplitude of the middle pickup.