and great job getting started!!!
IMO, unless there are comfort issues with the current pressures that are causing you not to sleep, you should leave things alone for a bit. AHI can fall more as you accustom to the therapy, and re: air swallowing, if you swallow on exhale a couple of times awake it will feel so much better you will do it naturally and swallow much less air.
If your AHI remains ~5 there is a good chance that using data the therapy can be "dialed-in" to better treat your individual needs. You should download the free/donation Sleepyhead software and review your data with help from the very educated folk here --- be aware that changing EPR can affect the therapy -- for the better or the worse depending on your individual needs.
Tongue Suck Technique for prevention of mouth breathing:
- Place your tongue behind your front teeth on the roof of your mouth
- let your tongue fill the space between the upper molars
- gently suck to form a light vacuum
Practising during the day can help you to keep it at night
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