A 46-yeаr-оld mаle pаtient (IBW = 85 kg) whо was injured in a mоtor vehicle crash has been receiving invasive mechanical ventilation for 24 hours. The patient is awake, alert, and looks comfortable on the following settings: VC-IMV with pressure support of 5 cm H2O; set rate = 8 breaths/min; set VT = 500 mL; FIO2 = 0.4; PEEP = 5 cm H2O. A 10-minute spontaneous breathing trial (SBT) yields this information: f = 30 breaths/min, RSBI = 145. What should the respiratory therapist suggest to the physician during patient rounds?