psiball questions

Considering that I have been practicing with psiballs for about 3 days, I consider my self moving along pretty quickly. Though, I do have a few questions. While I was practicing about 10 minutes ago, I noticed that my psiball increased in size only when I exhaled and decreased in size when I inhaled. Is that normal? Also when I decided to dissipate the psiball, it started to grow uncontrollably. It only finally went away when I moved my hands from each other and shook them. why is that? and the last question is about when after I created a good sized psiball, I started to rotate my hands around it. I noticed that when my left hand was above my right, the psiball would quickly diminish. but when my right hand was above my left, the psiball would either stay the same size or slowly increase depending on my breathing. Why is that?