Pressure sore question

I've been getting some sores on my forehead while using the Mirage Softgel mask. Maybe I should loosen the top straps some more also. The sore seems to be much worse on one side of the forehead support than the other. I'm not sure why, cause the top straps seem equal on each side. Though, it's possible that I sleep more on that particular side where the sore is worse? Maybe I should try to position the forehead support in a different area than the forehead too?