Thanks for the help. I tried scotchbrite and acetone on both the base and the filler. I increased the flow a little, and tried your recommendations with the angles. Came out much better. I think I probably had the flow to low, and using a scotchbrite instead of sandpaper to clean up my filler helped. I'll keep practicing, but the welds were much better. Must have had contamination somewhere, and just more attention to cleaning makes all the difference.