What's the make & model of your first stage reg, its orientation on your Halcyon Infinity kit & tank, and LP inflator hose length?
It's an Aqualung Legend LX attached to a 22" braided LP hose.
I doubled checked the setup. It doesn't seem as pronounced as I suspected. My left shoulder D-ring is probably only about 4" below my shoulder. When stretched out, the inflator house is higher than everything else.
Thanks for the tips, especially about ascending. I had been dumping air and swimming up this whole time. Will practice it.