it sounds like you are still confused about what you want to do and you are trying to fashion something yourself.

Have you considered going to a nutritionist? Getting a good one is hard, but a good one will consider everything you are thinking and come up with a personalized solution. And may be able to lead you to a ...a...a...(I forget what they are called), but it is someone who can do all the analyzing you are doing (about physical exertion etc.) and come up with a solution for you also.