Can you guys share me what Max Height and Distance you set your spark to? I know that the RTH height is whatever is in your surrounding area to clear the building's etc. But as far as your default Height and Distance.
I turn off the "Enable Max Distance" setting to ensure the distance is not limited. For the RTH Altitude, I set it to the altitude of the highest obstacle in the flying area above the takeoff point plus an additional 50 feet (to make sure the Spark definitely clears that obstacle).