Hi hatenchaos -
The issue about DAO is expected - we've disabled syncing in the Keep for a while, so no new data (heroes, etc) will show. Part of that work was, as you noted, marking the BSN read-only, so you can't use those tools. However, your characters should still be uploading and saved as you play, so we can pull the data in the Keep, once syncing is re-enabled.
For the other issue you mention, about not remembering exactly what you did - personally, I view it as "if I can't remember, it doesn't matter". DAO/DA2 have a log of what you did for some choices, but also have some known bugs for some quests . If you don't want to use those logs, I would personally enter and lock in the high-level choices you can remember and want to retain, and then pick whichever other plot choices you find most interesting - the Keep doesn't force you to choose what you *did do, so feel free to create a world with what you would *like to have done.