15* with wire perpendicular to the weld. You are asking all the right questions. Keep working it, sometimes you can even answer your own questions. The best thing is to ask yourself the questions, then you will see the answers when they come to you as you are looking for them.
The power of the question, our brains are constantly working to answer the questions we lay out to them . . 24/7 non-stop. That is why when you wake up in the morning after a night's sleep you have the answers you have been looking for. The old saying: "Let me sleep on that". Really cool how our brain works, subconcious works 24/7 problem solving too.