so my blue hollys look the same. yellow and very sparse, not bushy! what did you end up doing?

Do you use Hollytone? I use that some seasons, if there are any yellowing or dropping leaves. I also have different results with hollies depending on the location. Some that are in more shade have elongated branching and are less vigorout. I have one in the foundation that faces East, so it gets a lot of morning sun and that one grows like crazy.