While trying some settings tonight I switched my in game textures from 1024 (default) to 512 to try and eleviate some of the stutters that I had been experiencing. And while it seemed to help a little it brought on another bit of strangness. I was no longer getting tunnel vision when blacking out. The screen would still go from shades of grey to black, but would do so completely uniformly. One consistent shade fro top to bottom and left to right that would change in hue as I applied more or less G's.