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You can use any mask with any machine.
BiPAP and CPAP (or APAP) are used for treating quite different conditions. You can't just swap between them either. To set up a BiPAP requires an overnight study and an experienced technician. It is much more complicated that CPAP/APAP.
I agree (to the surprise of no one). Especially in an instance where there are possible complicating factors, an in-lab titration is definitely the way to get the best results.
You need not be too concerned about whether your machine reports obstructive, clear airway or anything else. As long as the overall AHI is low, which yours is, you should be fine.
A significant number of people with OSA are asymptomatic, meaning that they don't display any of the usual symptoms, just as you don not. However if a properly conducted sleep study has recorded that you stop breathing for periods during your sleep it is pretty unequivocal, and it will definitely have a negative effects on your long term health.
You could try insulating your hose. This could further increase the efficiency of your humidifier, thus reducing water consumption.
The most obvious explanation would be position-related obstruction. Occasionally you lie an position which makes your obstruction worse causing a temporary increase in your AHI. Doesn't sound like a bit problem, but if you are worried you cold see about increasing your pressure a little to see if it resolves.
8 events/night it not a lot, although they do sound like long ones. It's hard to say much without the benefit of data from a full study. The general rule is that if your total AHI is < 5 (all types of events added together, per hour) then you are probably OK. Generally, whatever gives the lowest overall AHI is best.
Not quite sure what you mean here...
That is how it increases the amount of air you breathe. Because the pressure increases every time you inhale, it is pushing more air in. It is functioning just like BiPAP. I'm struggling to think of a better way to explain it. Sorry.
It says in the menu
