The only way that I could replicate this issue was with my head physically touching the roof of the car. At 5'9, my head is typically four or five inches lower than that which is why I never have a reflection issue. I created a three inch black cardboard mask and placed it under the lip of the instrument panel so that it was protruding out a couple of inches. It was then impossible to see the reflection even with my head touching the roof, and the mask was invisible because it was hidden by the top of the steering wheel. Should Mazda create a slider that achieves the same end result as my crude mask? Absolutely, but in the meantime there is a free and invisible solution.