I have been using nothing but gas lenses for over 30 years, and it's very true that you need to not use too much gas. I did the whole cooling system on a research nuclear reactor in morrocco ( 6" alum pipe ) with a #8 cup, gas lens, and 24 cfh gas flow ( argon/helium ), and had 56 purfect welds. I still get more nervous welding race cars. normally I use a #7 cup , gas lens, 3/32 tungsten, and about 17 cfh argon. with this setup you can stick the tungsten out 3/8 of an inch, so you can see great, and not have any problems. this setup has been crash tested several times and has NEVER failed.
ED