You can use the low end setting and get a more gentle flame. Fuel is not not rushing out due to high pressure pushing it. Anytime you up the pressure, it's got more push and will move more gas through the torch, regarless of needle settings. It all depends on your working style. Some soft glass artists like a softer flame. For boro, I like a fast flame. I want the push and maximum heat. This is exactly why I like the Beths for a cross over torch. It can do both very well.