[Diagnosis] I dunno what I have.

[Schnova]

Which FFM did you try? If fitting properly they should be pretty secure. How were you sure the fitt was right?

The mask was the BMC FM2 FFM. I followed the user guide to measure the height between the bridge of my nose to under my lip so I was pretty sure the fit was right for me. As I mentioned I think the leaks was mainly because I move position a lot, I think it is due to getting upper back pain coz my mattress is getting quite old but I had very low leaks using the nasal pillow though.

[G. Szabo]

Hence, the APAP function indicated that you have been put on too low pressure. 
Let's find out the correct range. I suggest setting the minimum to 9 and the maximum to 15 cm in APAP and not changing the other parameters except EPR. Set EPR to 2 while monitoring CAs, considering your leaks.
Also, post a few 3-minute windows about your flow rates at different times.

[Old Steve]

I agree with Szabo, you need to raise your pressure and 9cm and 15cm are a good place to start.  You need to get control of the leaks. When you get a leak your pressure raises, this can also cause arousals.

[Schnova]

Hence, the APAP function indicated that you have been put on too low pressure. 
Let's find out the correct range. I suggest setting the minimum to 9 and the maximum to 15 cm in APAP and not changing the other parameters except EPR. Set EPR to 2 while monitoring CAs, considering your leaks.
Also, post a few 3-minute windows about your flow rates at different times.

Here is last night's OSCAR data. The higher pressure range disrupted my sleep. I woke up more often and with very dry throat and tongue which didn't happen with the other settings. If the mouth leak is the main culprit and not the higher pressure than I don't know what to do as I paid for everything out of my own pocket. The second hand market is still quite expensive here (I live in the UK).

   

[G. Szabo]

Now you are in the correct pressure range!

You must control the leaks because they wake you up and dry you out. Try to alter the strap tension. Tighter is not necessarily better. If it does not help, you need to find a better mask. 
Until then you
- You should set REM = 1 to mitigate the emerging CAs. If it is not enough, you must turn it off. Your flow limit is still high; hence, you need some EPR, which can cause CAs. So, you want to find a narrow path that is acceptable from both sides.  
- Increase the moisture setting and use a low-cost thermal insulator on your hose, available on Amazon. Do not be concerned about water condensing. I have been using moisture setting 8 at a hose temperature of 28C. 
- You might reduce the max pressure to 11 if absolutely necessary because of the uncontrolled leaks, but finding another approach for leak control is better.
- Modify the Soft setting to Standard; it gives you quicker and more aggressive responses that are more suitable for males

Let us know your progress!

[SarcasticDave94]

In this chart, high frequent leaks and higher CA are an issue. There's something not right with this mask for you. If well fitting and adjusted properly, it should be capable of handling the max 15 pressure. I'm thinking the leak pattern you're getting, those sharp, short duration spikes of leak to be mask generated.

[Schnova]

Now you are in the correct pressure range!

You must control the leaks because they wake you up and dry you out. Try to alter the strap tension. Tighter is not necessarily better. If it does not help, you need to find a better mask. 
Until then you
- You should set REM = 1 to mitigate the emerging CAs. If it is not enough, you must turn it off. Your flow limit is still high; hence, you need some EPR, which can cause CAs. So, you want to find a narrow path that is acceptable from both sides.  
- Increase the moisture setting and use a low-cost thermal insulator on your hose, available on Amazon. Do not be concerned about water condensing. I have been using moisture setting 8 at a hose temperature of 28C. 
- You might reduce the max pressure to 11 if absolutely necessary because of the uncontrolled leaks, but finding another approach for leak control is better.
- Modify the Soft setting to Standard; it gives you quicker and more aggressive responses that are more suitable for males

Let us know your progress!

Hey,

I uses micropore medical tape as my mouth tape and I decided to try something different last night. Normally I tape vertically so I can still breath through my lips if needed, which is what is causing the leak rate. I decided to really seal the lips by applying many layers of tape horizontally but I ended up not being able to sleep as I think as soon as I fall alsleep my brain jolt me awake. I only manage 2 hrs 20 mins. I was also getting aerophigia which made falling alsleep even more difficult.

   

[G. Szabo]

 Normally I tape vertically ...
I was also getting aerophigia which made falling alsleep even more difficult.

As SarcasticDave94 commented above, these lakes are probably related to mask-fitting. It would be best to have a different mask, or the pillow size is incorrect. I trust you ordered all the pillows; if not, you should buy the smaller and larger ones and try to use them. If they cannot help, you must find a better mask.

Let's mitigate your CAs: As I suggested earlier, set the EPR=1. This setting increases aerophagia; therefore, set your max pressure to 11. 

I also taped vertically with two pieces next to each other, covering a 5 cm wide range. It seals well and cannot leak.