I recently bought a new burner to brew with. It has a 5 psi rating. I figured I'd give it a shot during my brew session today. It's much quieter than my "other" burner. Unfortunately, it doesn't get my wort to a rolling boil. I'm assuming my other burner may be 10/20 psi. What is the best propane valve pressure? Any tricks to modify the 5 psi unit to get more umph?