It would be more beneficial to see the Pressure graph instead of the Mask Pressure one. The Pressure graph will show your pressure range and if it's plateauing. I haven't found any use for Mask Pressure to date.
When you look at you plotted data you need to find out if the apneas are happening right as you are going to sleep or when you are waking up, this is called sleep/wake junk and does not really count in the total.
If they are not happening as above, then with an auto machine, you may be able to increase the lower pressure to keep them from happening. What the machine is doing is looking for anything (like flow limitations and hypopneas) that typically lead to apneas and increasing the pressure to prevent a full blown apnea from happening. It is possible to increase the lower pressure setting to just keep these events from happening, so the machine no longer has to respond to them- they are just not happening to begin with.
The upper limit should be set higher than the 90% level, typically by 1 or 2 CM, if the machine wants to go higher, there is a reason for that and typically if the machine want to go higher, you should let it.
Now that being said if you AHI is in a reasonable range and raising the top pressure higher makes it so you cannot tolerate using CPAP, creates leaks that you just can't get under control, or you start trading OA's for new CA's then you may want to reconsider increasing the high end pressure.
Look at the graphs, think (and ask) about what might be going on, make small changes (if called for), and watch the plots to see how you are reacting.
Yes, the key is to make a change and then wait and watch. Watch for ten to 14 days minimum between each change. We look for trends. Data for a single night isn't worth much except to add to the rest.
Consider starting a sleep diary, noting down what kind of day you had, if you did anything different, if you had drinks with friends, lots of activity, etc. Then in the morning, note how you feel, how you slept, if you dreamt, etc.
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Breathe deeply and count to zen.
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