Mike, I would like to see the tip---------------of your Tungsten. Is it balled, and are you welding on A/C? I understand these are internal pieces, and will not be visible, but your fabrication skills impress me, and I think your welds can look better. Just questioning the process, hopefully in a constructive way.
As per my last tack.
I usually start with a pretty fine point and allow it to ball itself as I go. I keep a close eye on the first few to see if the point of the tungsten is going wonky and at risk of falling off. If it looks like sh*t I just flick it off and keep going.
That is a #6 cup and a 1/16" tungsten. I can share all of my settings if needed.
I did just learn a few other tack welding tricks such as setting the argon flow lower for tacking. Going to try that this round. Learning as we go.