There is a surprisingly common phenomenon with CPAP users called 'aerophagia', or simply 'eating air'. It is often caused by supine sleeping...on your back. You may also have a very common problem, if it can be called a problem, of having a lot of the volume circulating in your mouth, and if the sensation alerts you a bit, raising your awareness level, but not quite to consciousness, you may swallow some of the mouth's circulating air.

Avoid back sleeping, but also learn to keep the middle-to-rearward portion of your tongue tucked up, tightly, against the roof of the mouth and the pharyngeal tissue behind the hard palate. It's a learned technique, but it becomes a habit eventually if you practice it often for a week or more, especially during the day !!

Your pressures: I don't have access to your AHI, minute vent, flow limitations, max and low pressures and how long they persist according to the machine's sensing of your need, etc. But...I'm gonna guess that it's a tad high. That high number is your 'inspiration' or inhalation pressure, and most CPAP users run between 10-15 cm H2O.
My own range is 5.6-8, quite modest, even low by many standards, but it's all I seem to need these days with my AHI for the last two months being an embarrassingly good, and low, 0.1.

By all means, experiment, but keep a sharp eye on flow limits, and don't make large adjustments in a few days. Make smaller, 2 cm, changes and then see what changes in your reports happen over about four (4) days. Give you and your machine some time to figure out if the new flows are going to work.

Do you know about EPR? Expiration Pressure Relief? Almost all users need at least one cm of it, many need two, some three. Most machines that are not special machines like ASVs can only offer the user up to 3cm of relief when they exhale. This is a comfort setting, but key is that the reduction still has enough flow to keep your airway 'splinted' when your diaphragm relaxes and you exhale.

I'll stop here, but do please consider a site dedicated to helping people with their CPAP therapy. It's free, extremely rigorously monitored and managed (!!!!), and the membership includes some very dedicated and highly skilled people. It is apneaboard.com. No interest of any commercial kind....I'm an advisor over there, not a monitor or moderator/admin.