FoxTrot - Our Zig-Zag is a simple little step. We have the timing, footwork, and ect. But it still does not look good! Should it be Crisp & Sharp, or Smooth curving steps. We look like we are just trying to squeeze by each other!(I realize these words really do not explain what I mean, exactly!!) We have practiced it a "Million" times, and it is just missing something. It is so strange Silver or Gold Level not a problem, but go back to that one particular basic step, and it's just not quite right!
Any suggestions or Anyone Know what I am trying to say? LOL ScottyBoysDoll

I found that the Zig-Zag in Fox Trot looked better and felt better in open, rather than closed, position. Whereas, in the Waltz, it looked better and felt better in closed position.
Not sure if that is of any help at all, as you are a more advanced dancer than I, but for me it did make it feel and look more along the lines of what you describe as smooth, curving steps.
I do it almost like a pivot (on step 2) in the Waltz, but in Fox Trot, I take true S QQ S steps.
I will be interested to hear what others offer as advice