Larry
How fast are you going thru propane?? If you smash the end of your copper tubing and then drill with the #54 drill it will help a lot. If your blower is going full blast it is probably too much air. Make a gate for the input and damp it back. You r pressure may go up on your guage but pressure and flow are connected. Smaller hole higher pressure for same flow. My forge I had the air gate on the input almost completely closed and still had plenty of air for the fire. Also the forge should be really quiet. If it sounds like a jet engine it is not efficient. Let me know if I can be f firther assistance.
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