Don't take this the wrong way but it makes me feel a little better to see a bas *ss welder like you fight the distortion out on the panel skin too. I'm nowhere near as accomplished as you but I'm the 'welder' in the family so I'm the guy welding the patch panels on my dad's car. None of it has turned out how I want it to. Seeing someone who is really good at welding have some of the same trouble makes me feel a little less incompetent.
As always. Your work on the car is awesome. Sorry you had a bad time with that door skin. Just get back up on the horse. I have every confidence you will get it where you want it.
When you are butt welding a panel with the MIG, you need to leave a gap. If you didn't that may have screwed you.
For shrinking, I use my student welder with the shrinking tip, not everyone has one I know. I never could mater the torch process. I've always made it worse. Hopefully you can figure something out.
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