In the vein of the Harry Potter and the Methods of Rationality discussion threads this is the place to discuss anything relating to Alicorn's Twilight fanfic Luminosity. The fanfic is also archived on Alicorn's own website <strike>(warning: white text on black background)</strike>.
Previous discussion is hidden so deeply within the first Methods of Rationality thread that it's difficult to find even if you already know it exists.
Similar to how Eliezer's fanfic popularizes material from his sequences Alicorn is using the insights from her Luminosity sequence.
Spoilers for the fanfic itself as well as the original novels need and should not be hidden, but spoiler protection still applies for any other works of fiction, except for Harry Potter and the Methods of Rationality chapters more than a week old so we can freely discuss similarities and differences.
EDIT: Post-ginormous-spoiler discussion should go to the second thread. (If you have any doubt on whether you have reached the spoiler in question you have not.)
Carnivores taste better than herbivores; omnivores are presumably in between. I implied, although perhaps not strongly enough, that Edward tried a shark; it was more or less in line with predators in general. There's not enough variance to expect there to be a particularly excellent species somewhere. Individual vampires have preferences within animalspace but there's no way to predict what Bella will like best until she's sampled a few kinds.
Nope. It's best straight out of the jugular.
Maybe. Bella's probably going to start something along these lines once she can stand being around human blood - she wants to figure out what there is in human blood that makes it tasty. (Carlisle could start something like this, but while he's a fine character and whatnot, he does not have an experimental mindset, and would be unlikely to give up large chunks of his time to satisfy this interest of Bella's. For example, instead of thinking about what might cause vampire venom to cause turning, and then getting a lot of it directly into Edward's heart when he was administering his first turn, he settled for recreating the bites he himself had received. This, it turns out, made the process unnecessarily drawn out.)
Your other questions have, as you noted, been addressed.
So, I know this is a long-since obsolete issue, but it really is a good thing for story purposes that none of the Cullens are experimentalists by nature. Hooking up an experimentalist with a precognitive is a balance-destroying arrangement... you get the results of any non-longitudinal experiment you make up your mind to perform, with a direct perception of whether that result is reliable or just a statistical fluke, without actually having to perform it.