I can't tell from the picture, do you have a needle valve on the gas line? If you don't, I'd install one. It will really help you regulate the gas flow. Also, I you put that propane cylender outside of my shop if it is very inclosed. I have mine inside but it's all open windows on three sides. No where for any leaked propane to gather. There's a reason that stores that sell and fill these things don't allow them inside the building.
Old age and trechery will always overcome youth and ambition.