I am still playing around with my counterlung placement. At one time, I placed them a bit on the lower side. However, I found that when I did so, gas would get to the bottom of the counterlung, pitching me forward when horizontal. This didn't happen all the time. However, it was enough that I decided to move the counterlungs.

I raised them up a bit, and that problem isn't there anymore. However, it is getting annoying with the counterlungs rubbing on the underside of my chin and the underside of my jaw when I turn my head.

I might try splitting the difference. However, there is not all that much difference between where I had them before and where they are now. Is anyone else having the same issues? Did you come up with a good location that works for you?