Yeah its not brain surgery at all, if it was id have a lot better tools. Anyways looks like my results are very similar to yours, BTW nice pictures. I have the same procedure, cutting, deburing etc so nothing new locating the tube in the same place in the fixture making sure its flush. I think the issue is in the tube nuts. I'm reusing OEM ones and I'm guessing they have less room to allow the tube the flare, since its obvious the tube nuts you are using slide all the way down to the flare shoulder. Ill pickup some tube nuts this week and see how it comes together.