I've watched many videos of this type. What stands out (and I did not know this nor did any videos point it out) but your tungsten size and rod size are critical. the cup size I get....gas coverage..all these YT videos are in it to sell their goods and kits. Only around last Christmas a pro welder came over to my place to help me set up my TIG box. I did a quick demo for him on some 18ga and he said....your filler rod is too big. and for thin material go to a 1/16th tungsten. made a ton of difference. I felt embarrassed. I just didn't know these things. I may tackle what you are doing in the video, again.