No gas to cook top

Finally was able to speak with a propane valve engineer. He surmises that what I havre taken for a regulator at the cook top is actually a flow shut off valve installed there for safety reasons. As he explains it, this is not mandatory but is sometimes used to shut off flow in the event of a line rupture. On the cook top at high elevation, when the stove valve is opened, the atmospheric pressure is not sufficient to push the ball/spring arrangement open against the flow supplied by the main tank regulator — which I believe is a constant at a given regulator setting. The flow control valve senses too much flow and closes, shutting off the gas entirely. He says that the flow valve is only there for safety reasons. Soooo, I am wondering if turning down the main regulator at the tank is a solution.