I can't advise you because I'm not your caregiver, but I can suggest you place your circumstances and current settings before the forum at apneaboard if your health care team doesn't want to titrate you again. There are several highly knowledgeable forumites there, Sleep Rider among them and probably the most helpful, who can take a look at your OSCAR results and suggest some tweaks. Most of us use EPR, even if only set to one cm H2O, for comfort. You may find that two, even three, works better, but you must trial it for at least three nights to see if the effects are durable.