I use 150-160 amps, 125Hz, 30% AC balance (as set on machine), 50-60pps., 30%pulse amps ratio and 60% pulse time on. This is on a 250EX. Same settings work at 180-200pps. and at least up to 205 amps. I also had a hard time with pulse until i found these pulse settings on weldingtricks etc. There is a lot going on and a lot of coordination in TIG welding. When you add pulse there is just more info to process and my brain couldn't handle it. Anyway i hope this helps.