Well - In this case my qualifications were following the manufacturers clear instructions on tuning pressure in the manual.

Firstly, the device was apparently made to be adjusted. A single set of settings is not comfortable for all users, and the manufacturer recognized this.

Secondly, that's the wrong question entirely. People have a right to decide their own medical treatment (or refuse it entirely), and that right must not be circumvented with legal or technical means.

Their device, their business. People don't need to justify what they do with their things.

"We properly read the manual"