What is your gas flow? And you not balling back your tungsten, right? For what it is worth, I hate ceriated. 2% lanthanated, sharpened to a dull point, lights up every time.

You may have a clear coat on that anodized pipe, thus it welds like trash, and has a hard time starting. What is your filler? 4943 is the gnat's ass.

Once again, start with a default program and get some hours under your belt before you did what I did, and wreck the settings.