I haven't touched them so they're just factory default. Would lowering them change the tone too? I've raised/lowered pickups on other basses before and it seems to only change the volume?
Factory default is generally on the high side. The dealer I got my NG from explained to me that high pickups can actually deform the string's pattern of vibration and choke the tone. He then adjusted the pickup height in front of me while playing the open string, and I found that there was a notable improvement in clarity that overrode any drop in output.