NEWBIE! Inconsistent AHI, Long event times, is this normal?

That sounds like your OSA is highly positional (Much worse on back as compared to sides or stomach.).

Mine is like that. If I stay off my back, I can use a moderate pressure to achieve low AHI. Or, I can wear the firm foam cervical collar and achieve the same results in any position. I opt for the collar and sleep on my back most of the night.