Finding is good mask that suits you is difficult. I use a ResMed AirFit P10 nasal pillow mask. It is a very minimalist mask and is comfortable. If there is a weakness, it is the headgear. Fairly recently they have come out with a somewhat improved headgear for it. I believe it is the most popular mask used. But if you open your mouth in your sleep, it is best to use mouth taping. I mouth tape every night.
With the ResMed machine events are not reported when the leak rate of the mask exceeds the redline of 24 L/min. If evens are flagged during a high leak period they should be identified as Unclassified Apnea (UA) events, and the machine does not respond to UA events. So, pressure should not increase while the mask is leaking. You can confirm that by looking at the OSCAR pressure graphs to see what the pressure does when you are having a large leak - there will be grayed out areas of the graphs when the leak exceeds the redline.
If you want to post a typical OSCAR Daily Report screen here I can take a look at it to see if there is anything obvious that can be done. To do that on a PC make the Daily report full screen with a full screen window and press F12. A box will pop up asking where you want to save the screenshot image. Save the file. Then with a full width post here, find the file with File Explorer, left click on it, and then drag it into the post here. It should upload.
Based on what you report your AHI readings do seem fairly high. What is the average breakdown of the various components of the AHI? You should be able to see that on the Statistics page. AHI, OA, H, and CA events are the important ones. The 95% pressure is also a useful number. If you have imported a year's data there should be some good averages there.
However, I can tell you the most if you post a Daily report screenshot for a typical night. I posted an example of one in an earlier post.