Unofficial Dawnguard Patch may help us and others like us: http://skyrim.nexusmods.com/mods/23491/ I got through the Soul Cairn by doing the old save move five inches - set quest stage past the keepers - move five inches, crash, load, move five inches, save, move ten inches, crash, and so on and so forth. It's not much better than your flying method, TheDarkNexus, so I hope the Unofficial Dawnguard Patch works out.