Starting Spec is always a good idea. But don't lose your mind about spec.
At the end of the day, pickup height, pole height, and the guitar/amp tone all get involved. It's by your ears in the end. No two pups are gonna sound the same.
I will say too close to the strings is a tone killer. Sucks the sustain right out. And for hotter pups, sometimes a little lower is actually better! (Just a littleā¦)