Johnny Redland, Many people wrongly suppose that citrus fruit draws all their required growth elements to produce a fully grown fruit from the foliage of the entire citrus tree. However, research as shown that a particular fruit draws all of its required energy and nutrients only from the three closest leaves to the fruit, and not from the entire tree in general. Thinning the crop load, especially the fruit clustering will help a lot to increase fruit size... especially on young trees. By the way Johnny how old is this tree?