TIG welding sheetmetal

[Sandbagger]

After some reading last night ...
I have been grinding the tungsten incorrectly .
Right on the machine it says 20g -difficult ,and a guy at the welding supply says an Econotig only goes down to 20 amps and I would have a tough time .
I have welded 1/8 inch plate with this machine ,just having a tough time on 18-20 -22 guage
I am useing the rod & tungsten you suggested .Metal is clean and no gap .
Check the gas flow And try again today . It has to be something simple Im doing wrong ...
Thanks ...