TIG Welding Text books show an optimum torch angle but in the real world, those optimum angles go out the window on odd shaped parts with limited access. Fortunately, torch angle is usually pretty forgiving
Stainless Steel needs either backing or argon shielding to the back side when the back side melts. Argon shielding usually gives the best quality but Copper or Aluminum backing can also work fine depending on engineering or code requirements
While downhill Welding using XX10 electrodes is still very common,The Oil and Gas industry is seeing more Low Hydrogen Root Pass welding procedures.
Since it is a far less common procedure, this video should help anyone get better at open roots with low hydrogen electrodes
Sometimes when you are out of practice, its good to just practice until things feel natural again. I welded a 3g butt on 11ga aluminum and the first try did not go so well, so I settled in and just stacked a few beads on scrap until things felt more natural and comfortable