I thought again about your graphs. You have a remarkably narrow range of pressures that you seem to need, at least based on that one night's data. Again, if it were me, I would give serious thought to simply raising the minimum pressure setting to 8. It's more than you typically need, but just barely so, and will guarantee that you are always at a pressure that curtails your apneas.
As for your doctor, what do you think he would prefer: blind obedience to his recommendation (that was based on one night's data in a foreign environment), or participation in their treatment by a patient based on multiple night's data from their home environment and well reasoned analysis? You could even call him, explain the situation, and get his concurrence.