That looks like a very strong and healthy Phal just allow it to do it's thing i would say. I bought a Phal last year in July and it is still blooming a lot of the flowers have dropped but are replaced by new ones. Today i notice the tip of its spike swelling perhaps ready for more blooms. I do notice that the flowers are closer together rather than more evenly spaced out as if the spike is not extending the length as much perhaps of its age??