I don't think I have demodicosis, but I do think I have a malassezia proliferation and a terrible bodily immune response to it; i.e., seborrheic dermatitis
Is there a specific reason why you've discarded demodex as a causative factor and believe it's Malassezia? I ask because the symptoms that you describe could just as easily be caused by demodex proliferation, so I'm having difficulty understanding why you've ruled it out.