The positional needs to get under control first, thats what i am saying.
Hard to tell otherwise sometimes what is going on for sure.
Collar not too tight, not too loose.
If you are a real big chin tucker, you could breach that possibly, trial and error.
Just got to know what to look out for, which is impingement on areas of your airway.
and for sure stay off your back!
Now if you wanted to reduce EPR, no law against that!
And i am sure you will be fine.