Been making them for a while but still make the same mistake. I try to make both pieces at the same time instead of making one step of one piece then the same in the other to keep them the same. That way you end up with the curves different in both pieces Works but not the most efficient method.
I really have to keep it a step at at time.
Don't know what you are worried about with your tongs though. They look as though they are practical and, like mine, not too ugly. Great effort! That is why I like making tongs, they are a real challenge to make a set that works AND look good.