Hey Arnie, welcome to the "International Brotherhood of Paper Thin Metal Welding"! This is the very reason why I bought a new welder capable of welding thinner material then my others could. A few years ago I bought a Millermatic 140 which helped a great deal but is still no match for a TIG welder. I've never used a gasless MIG, so don't know what that's like. After experimenting with your settings on a sample piece of metal of the same gauge there are still other ways to improve your results. You mention the flange tool, which is great if you are able to use it in the confines of the repair. It gives you more surface area for the weld to flow over without burning through an edge. In areas where butt welding is neccesary or prefered I use a variety of copper tools to serve as a backing. A few heavy duty copper chisels, drifts, punches and other implements I have collected over the years, get used for this purpose regularly. As long as you can use the copper for a backing and use a momentary on/off welding technique the weld won't be able to burn through and will not weld to the copper. Do not try to fill gaps much wider than twice the thickness of your wire. I keep a can of nozzle dip on hand for coating the copper. A little practice, some grinding, going over it again and you will eventually get the results you desire. Practice makes perfect. Good luck!