The only guidelines I could suggest is that if the pickups are passive don’t have them to close to the strings. Passives have a much greater magnetic pull than their active counterparts and if set to close can cause issues with the vibration of the strings, which in turn, effect things like sustain.
I would suggest starting with them set at around 2mm from the strings and play a bit, set them a little lower and play a bit, repeat until you find a happy balance between output, sustain, tone etc.
If your pick ups are actives, check your battery too.
Hope this helps.