Big Tee: Your project is interesting. I think these table legs/supports will be much stronger than the Chinese ones you bought. As for the trouble you have ran into keeping the welded final product straight. This is always a major problem with welded assemblies. The lighter the steel the more they seem to warp.
I made a 24 foot steel roll back bed years ago. Just channel iron rails with tubing cross members. All of the welding on the top of the rails made them warp six inches over the 24 foot. I had one large teeter toddler. LOL I finally flipped it upside down and ran a bead of weld the entire length of the bottom of the rail. That contracted the bottom of the rails so they were then flat.
So your stressing the parts before is one way to compensate for contraction of the weld after cooling. You can also do it with additional welds.
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