TIG welding sheetmetal

[Sandbagger]

I could use a little advice here ....ok allot of advice
Im trying to tig 18 & 20 guage sheet metal . I do alot of patch panels .
Not having much success with this Miller Econotig . I have a foot pedal .
I have tried 3/32 tungsten .Today I tried a 1/16 tungsten and filler rod .
I was told today it would be very difficult to do 20 guage with this welder .
True ?
3/32 I burned through . 1/16 not enough .
I have been grinding to a point allot like a #2 pencil . Tried all kinds of stick out with the tungsten .
frustrated ...

When I turned the amps down , I got an arc through the cup , or diffuser . Not the tungsten .a couple times .