Welding patches in bedsides and doors will test ones patience. If you are going slow, you need to slow down. Slow isn't slow enough.
You should be able to touch the weld without burning yourself before you start another series of dots between the ones welded prior. Plannishing the hot dots with a hammer and dolly will help prevent warp and transfer the heat from the dot to the hammer and dolly.
As far as how high to set the amperage of your welder, its higher than what seems rational. You want to buzz a hot dot almost instantly. A low amp dot will take longer to get full penetration, thus increasing the amount of heat spreading into outlying area of the panel causing warp.
