What it comes out of the factory as isnt nessicarily optimum.
Maybe best to play about and find whats best for you? Someone who slap/pops or plays the thing really hard would want the pickup lower down than say someone who plays very soft finger style
"The factory specifications for the pickup height is 6/32" or 4.76mm from the top of the plastic between the pickup covers to the bottom of the G string. The angle of the pickup is set fairly level, so the larger strings are naturally a bit closer."
I do the 6/32" under the G and 7/32" under the E, similar to the Fender "slant" and it helps with the volume on the G.