Early on I kept bumping up the pressure and the time to half an hour. But he didn't really like it when I increased the frequency. Last year when I was working with some of the other moms on a CF Rummage sale, they were saying how their kids would fall asleep with a frequency of 19? And I was feeling like a BAD mommy! DS does NOT sleep with the vest and early on gave us fits if it went too fast.
Then this summer at the hospital, the RTs had a lower pressure setting, but every 5 minutes would have DS break for a cough and then up the frequency. Which is basically what we do now. Just wish we had one of the newer machines in which we could program it to do all that. I do think the more frequent cough breaks help as well. He's also gotten used to the increased frequency except when playing Clone Wars on the Wii -- makes him shake too much. <img src="i/expressions/face-icon-small-smile.gif" border="0">