A 38-year-old woman with severe COVID-19 pneumonia is intubated on day 5 of illness. She is on Vt = 6 mL/kg IBW, PEEP = 12 cm H₂O, FiO₂ = 0.8, and sedation with propofol and fentanyl. Her PaO₂/FiO₂ ratio is 95 mmHg (severe ARDS). Chest X-ray shows diffuse bilateral consolidation. Hemodynamics are stable. What is the most appropriate next step in management?

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