If you want your foot wider / outside,
you move the cleat narrower / inside.
Everything is reversed between foot / cleat, because you are working on it from the underside.
It’s possible and angle shim might help too, but theres not enough info to recommend one over the other right now.
I had a pretty similar variance with my Giro shoes that were about 3 years old, although the cleats were fine, now I have a new Specialzed Ares shoe and I’m weirdly pretty centered again
Material fatigue on Giro shoe after 3 years of use?
it started slow for me too, first i tought, hmmmm, a Garmin Update on Edge and so on, first i ignored it too, but time by time the values increased, so i decided for a other reason to try new shoes and then the surprise, they are almost centered with only 1 or 2 mm difference what i think is normal
if you need a varus or valgus shim under your foot and keep adjusting the cleat to get a 0 offset @center without fixing the varus/valgus I can see issues arise. The PCO values may mean you have issues other than just adjusting your cleats in or out or your Q factor/pedal stance. And of course it could be one of the other 100 bike fit issues that needs adjustment.
Point being, a zero offset might be ideal but only if you get there in the right way, otherwise it may make things worse.