Hi, Michelle. Welcome to the forums! I haven't been in the CPAP therapy game for very long, so I don't have a lot to give you just yet. But here's a few things:
First, if you register and show your equipment, you can get a lot more help. There's people who know your equipment inside and out and can help you adjust settings and such for better therapy.
Next is the Sleepyhead software. It gives much better data than the control panel on your machine. If you post the charts, you can get lots of help. There's a sticky at the top of the forums with links and tutorials.
Finally, what I've learned (or I *think* I've learned!) is that the "clear airway" or "central" apnea is supposed to be the brain not telling the body to breathe. While that's true, your CPAP machine can only read how you're breathing based on the air flow as you inhale and exhale. I'm sure we've all caught ourselves holding or "locking" our breath while we do something. Looking at my Sleepyhead data, I can often see clusters of "CA" events that I know are not central apneas - I was turning over or messing with something, and "locking" my breath for some reason, but I was awake and aware. Sometimes I'm holding my breath in the middle of the night so I can listen better to some noise.
Dunno if any of this helps you much, but somebody much more knowledgeable will be by shortly. :8>)