You are absolutely correct in your representation of Feanor and his sons as real people and not evil at all from the beginning. This is why I think someone has to write about them, using what little information Tolkien gave us, creating stories that are rich in details of their personalities and characters, showing their family lives, etc., just as you are doing with this story! I always thought that all of the stories from The Silmarillion would make great novels on their own, and then great movies, if fleshed out, each on their own. Feanor's story, is of course, the most intensely interesting one. Oh, btw, just because I wrote him as evil in my story, I think I wrote him with a lot of depth, and he was written as evil only to serve the story purposes. I started it so long ago, and it was before I realized that I really loved this character. My stories don't matter to me much once they're done. I'm not really attached to them in that way. Basically, I feel I'm just experimenting with different styles, etc., until I can find my way to writing a great one. So I can take a lot of criticism. I find it's all very constructive.