Your tree's leaves really are curling. Reading your past posts, I understand your caution on watering due to past root rot problems. Know however, it is not the amount of water that actually casus root rot, it is the lack of root zone oxygen that causes the damage, and this is caused by the porosity of the medium. You should slip your tree out of its container and examine the root system, to determine if the entire root ball is receiving water. Water many times channels through the container laving some section wet, while other sections remain dry. Also determine the porosity of the medium. The leaves look under watered.