How do you manage PEEP in a morbidly patient with severe hypoxia who is already proned with no access to esophageal ballon?

We do not use esophageal balloons at our facility. In patients we are proning, I usually titrate the PEEP to the lower inflection point on the pressure-volume curve on their vent graphics and tweak from there based on their level of hypoxia and plateau pressures. In morbidly obese patients, higher p...