I need some help with my Mexican Fan Palms. We had our trees put in on January 8th and my trees keep looking worse and worse. I do live in AZ and was told by the nursery that they take 12 gallons of water a week. We did have a new drip system installed. I can't tell if I'm giving them to much water or not enough water. I do have a moisture meter to help. When I use the meter on the outside of the base of the tree it says wet. When I put it right near the base of the tree some spots will say dry other spots moist or wet. Should I take the reading closer to the base or outer part? Is it better to water with the slow drip or slowly pour water over the base? I've attached a few pictures and would love any help.