Need a little help with my vest... I read Amy's blog about the hz and all, and I'm kinda confused, not to mention realized I haven't been changing anything(especially after my bout with the liver infection- it took me a month to be able to use it again). I've just left it set at 8 hz and I guess the other number would be a pressure of 6? for 30 min., but I guess I should be changing it up. I have a hillrom 104, with a medium full vest. What do I do? What do I try?<img src="">