I agree with Zonk. I see lots of flow limitation, which might mean your airway is partially collapsing. Not enough to count as a hypopnea or apnea, so it doesn't show up in your AHI, but it could be preventing you from getting the deeper restorative sleep you need to feel better when you wake up in the morning.
Your CPAP is set at a fixed pressure of 7? Your machine is capable of being set to a range of pressures, and what it will do is automatically raise the pressure in response to flow limitation.
You mentioned that you're not even sure if you need the CPAP machine? Didn't you have a sleep study where you were diagnosed with mild, moderate, or severe obstructive sleep apnea?
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I recommend getting a copy of all 3 studies if you can but definitely the COMPLETE sleep study that you had last. It will or should give you a lot of information on what they did during the sleep study as well as detailed info on events, etc.