Your apnea could be undertreated, or it could be a symptom of a bigger problem. Epiglottic collapse is not uncommon in apnea patinets (10-15% of cases), and is not treatable by positive pressure, as it is an inspiratory valve.
CPAP only works on the expiratory valve - which is your soft palate.
If you are having a large number of arousals, despite optimal CPAP pressure, and your respiratory waveform is jagged in certain ways (hard to describe in text) - you are very likely having epiglottic collapses.
However, epiglottic collapse can only be definitively diagnosed by sleep endoscopy.
Epiglottic collapse can only be treated surgicially.
CPAP only works on the expiratory valve - which is your soft palate.
If you are having a large number of arousals, despite optimal CPAP pressure, and your respiratory waveform is jagged in certain ways (hard to describe in text) - you are very likely having epiglottic collapses.
However, epiglottic collapse can only be definitively diagnosed by sleep endoscopy.
Epiglottic collapse can only be treated surgicially.