Thanks for writing this. I think being confident that a fish will travel 10, 15+ft to hit a shallow JB is very important...I'm still working on that, but reading others' experience definitely helps.
Personally I feel that the more distance they travel to investigate your bait, the better chance they'll commit. I've seen it on the graph while vertical fishing a lot: in clear water the ones that float up 10+ft to look at your offering are the ones that end up biting. Maybe it's the same with a shallow JB over deep water.