The hiss comes from having the voltage set too high. You're looking for fast consistent buzz/crackling. Adjust the voltage until you have the fastest crackle sound. I don't think it sounds like bacon that much actually so I think that is misleading. You want it to sound like in this video: Also how aggressive it sounds depends on the inductance of your machine. Some machines have adjustable inductance. Also as you increase the wire feed speed and voltage the sound becomes naturally more aggressive sounding.