What is the opening on your gas line into your forge?? If you are looking for a little more control try making the opening smaller. I used to pinch the end of some 1/4 inch copper pipe and drill a hole in it to the size I want. I used to use a #54 drill. You may need to play with it to get optimum performance. I have since gone to a design based on Kevin Cashin's forge set up On his web site. It uses a needle valve to control the amount of gas allowed into the forge and a gate valve to control the air flow. Much better efficiency that the old forge and easy to control at lower temps.
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