Wow! Things are much better. Looks like drying out the soil and then giving a heavy watering with a light nutrient mix did the trick! I now have the light at about 13" and it seems to be about right. Someone told me the the gap between each level of fan leaves is large because my light was too far and the plant was stretching itself to reach. Going away for another trip, so repeating the dry soil/heavy watering process, this time with the recommended fertilizer mix (10ml/gal). Gave each plant about 1/4 gallon of water/food mix.