I also "winged" it when I taught my dog leg weaving, and my approach was almost identical to yours. I agree that exaggerated slow steps provide a good reminder of what the dog should do when you're fading out the lure. I actually made a video tutorial showing how to teach leg weaves (as a school project) which I would love to post on here for others to critique, but it features my neighbor's dog so I'd have to get their permission first.I don't know that the method I used is standard since I just kind of winged it on my own but I used verbal cues with a lure in the beginning. I would lure the dog through my legs while taking an exaggerated slower step forward and say zig while luring the dog through. I stayed on this simple process and then added in the zag after she knew the zig. I tend to use more hand signals and body signals than verbal cues but for this training behavior I thought it best to stick with a verbal cue since I didn't want her weaving every time I walk with her. I somewhat believe that my dog keys on my length of stride because when we weave, I have to take larger than normal steps because she's a larger breed dog. So, between the verbal cue and my longer than normal stride, she has more than enough indication as to what she should do.
Don't know if this helps but it has worked for me.
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