You are using gas right? You can will need to weld both sides, or run it hotter. I noticed the angle of your wand when welding, I use more of an angle, but thats subjective. Its good to move around, like you did. I think you need to crank it up a bit, then you wont have to weld both sides.
Remember, everywhere you weld, you will be putting a 1/8th or so inch skim coat of bondo on. I dont care who you are, you wont get around this. Most of it will be sanded off, but it will help smooth things (both sides). You are doing just fine! Its a matter of experience with your welder. Nice machine!
