You might want to check out "The Mislabeled Child" by Brock and Fernette Eide.
http://mislabeledchild.com/It talks about different learning challenges and twice exceptional kids. Some of the things you mention sound consistent with their "stealth dyslexia" characteristics. They say that in gifted kids, a dyslexic processing style often manifests in problems with writing, including spelling challenges, but not necessarily in their reading. Phonological deficits also fit. I don't know about the other stuff. It may be worth checking it out of the library over the summer.
