I was the solo "personal preference" voter. I definitely don't inflate to max psi, or any where near it. Anyone who does is uneducated, whether they call themselves a technician or not.
The whole reason I go with personal preference is I like my tires around 35 psi, even though my Lancer suggests 32 on all corners. Max psi on my DSW06's is something like 51 psi. 46 psi is WAY too high and will provide for an uncomfortable ride.
As for varying psi my Stealth says 35 psi front and 32 psi rear on the placard.