Well, regardless of the causes of angel wing, the problem seems to have corrected itself. I wrapped for a few hours for two days and it made some difference I think, but it was more a gradual progression towards the normal tucking of the wing as time went on, and now that the feathers have come in a bit more, it is to the side.
Quite an interesting debate, I would hope for more scientific experiments on the matter for those who have the resources to have a control group, a protein rich group, and a carb rich group. I also think that it may be more than a genetic/protein/carb things. I have not heard any ideas about an excess or deficiency in a specific or group of vitamins/minerals as a possible explanation.