artigiano,
I don't know what temps you're at but with a WFO I'll assume higher that 550. Oil was put in formulas for 550 so it stays moist and chewy, whereas at high temps you don't need it since it cooks fast and does not dry out. This is why pros here, like tdeane, will say "Oil has no place in pizza" as he cooks in a real pizza oven. (I think he adds beets though, not sure) My advice would be omit oil at higher than say 600.