i dont know anything about doc calls but i do believe theres no such thing as a "non-sticking" call. all calls will stick once they get enough moisture under the reed. sticking is just a part of duck calling. i've heard of putting rain-x on the reed but ive never tried it. when my call starts to stick i take some cloth or something and wipe under the reed, or i take the end piece out, turn it around, hold up the reed and suck the moisture out.
hope this helps
It's an Obsession