Quoted from pinballinreno:
Always play if first, then adjust. There are differences and adjustments that vary a bit on the assembly line.
Tweaks will also depend on your environment. WOZ seems sensitive to local power variations so you may have to adjust a few things up or down accordingly. I'm set almost entirely factory myself but did have to bump up my ball trough kicker.
Personally, a physical asjustment I like is to have my outlanes moved in on this game... they are like ball vacuums on factory. Even moved in a bad shot can still easily go straight into them but at least you have a chance.