To sum it up for you, Ayrtek is easily the best helmet out there, it just takes a few nets to get used to!
Think I am having similar issues to several people here. When inflating the helmet always wobbles too much side to side if I shake my head until it started to rise from being over inflated. Are people using normal helmet sweat pads or Ayrtek ones?
Doesn't sound like you are using it properly. Put the helmet on, do the strap up tightly and then inflate the ACIS system. Haven't had a problem with doing it like that.