I just received my new Costco HAs (Kirkland Premium 4.0), and in general I am very happy with them. My only problem is with the ear molds. Pressure builds up inside my ear, and makes them very uncomfortable (even painful).
Is anyone aware of a vented mold? I would think that in the molding process, they could insert some part (later removed) to make an internal path for air to move. I’m returning to my Audi next week to see what could be done in this regard (I don’t want to ask for the impossible).