Personally I have never dragged my toes when cueing drag the rear foot. It just kept me from doing what Lewis is doing in that video, pulling the heel to butt. Tellez cues push off the front block and if I really cue full extension ofF the front block I have had toe drag like Powell and Bolt.
It seems like cues are individualistic, I.e. Flicking the leAd hand doesn’t help me.
You guys have way more experience than I do though.