Have you been able to find what the different numbers mean? An AHI of < 5 is considered normal. An AHI of 0.4 is definitely good.
Are you having any large leaks? Large leaks matter because the machine doesn't recognize events during large leaks.
The numbers you're posting make me think you're using the EncorePro Analyzer. Is that the case?
Have you found the detailed daily reports in EncorePro or the Night Report in the EncorePro Analyzer? While the average over several days is helpful, I look at my daily numbers so I can see exactly what happened the previous night.
I've put examples of the 2 key daily reports I look at. I added some notes about what you're seeing. I also reduced the size of the screen shots - the ones you produce on your computer will be easier to read.
Here's an example of the Night Report from EncorePro Analyzer

Here's an example of the Daily Detail Report from EncorePro:



