Body help/advice needed

As far warping with welding, think little spots one next to each other, skip around the panel and let it cool before placing one next to it. I would clean up that glue and go down that horizontal seam in that fashion. The welding on the trunk drop off looks to need a little more heat or less wire speed. You want enough heat to get the job done without unnecessarily piling metal on. Cleaning with wire wheel and wiping with a dewaxer prior to welding will help. Contamination makes for porous welds. I hate grinding weld lol