@Albatros, I am at 16 cm and there is only really about 2 - 3 cm drop during inhalation. Since your lower you might only see 2 cm drop. During exhalation the pressure remains at the therapy setting (13 or 14 in your case). Make sure you also turn EPR off, if it is on. Please be aware that there will...

I have been using a VCOM for almost two months now. and I can second most of what @dmoss74 has said. I get no leaks, coming from about 20% leaking every night pre-VCOM Lower flow limits, I unfortunately have two 0 flow leak days in my OSCAR records because I am an idiot and forgot to put the SD card...