GTT sends an instruction sheet with each new torch and the recommended settings are listed on it. The big torches (Phantom on up) also come with a video.
The settings are higher because the orifices are smaller, thus requiring higher pressures to force gas and oxy out. They do not use more fuel or oxygen, they just need it pushed through at a higher pressure.
When I run my Phantom, I run the propane at about 8 psi and the oxygen at 25 psi. It is safe to run higher pressures. The valves are very high quality.
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