All in all the citrus in the last picture just looks under fertilized, as shown by the yellow/orange veins in the leaf center with some green out on the far sides (symptom for nitrogen deficiency). The medium that the tree is growing in looks to be OK for adequate drainage and root zone oxygen availability. Foliage Pro is a good citrus fertilizer, although expensive. Citrus are heavy feeders, therefore require more nutrition than most plants. Organic fertilizers are OK, if there are ample microorganisms present to breakdown an organic fertilizer into a form usable by the tree. There is no where near enough microorganisms in container culture to accomplish this. Therefore, an organic fertilizer is not recommended in container culture. The trees in the first picture shows that they are now growing in containers that are too small for the tree's size. When a tree's root system has filled out all of the available container space, its growth becomes straight up, like toothpaste squeezed our of the tube. Theses trees also show that they now have or have had an insect problem, probably mites. They also need more nutrition. Welcome to the forum, happy to have you as a member. The best to you and your trees.