I think you did a very nice job and you are quite thorough! My only suggestion are style issues. Well, except for the US too early in the birth date.
If I were working on this profile, I would not use any abbreviations in the body of the biography and I would write it like a story instead of a listing of the facts. Consider indenting the second paragraph since that is a quote. You can indent by using the colon ":". Two colons indents more. I like that you gave a shout out to the town clerks! I would put that below the Sources under an Acknowledgements heading. You should also write in the 3rd person like when you said you visited cemeteries and did not find any possible parents. If you'd like to leave it in the first person, you could "sign" your comments with four tildes (I think that's what they are called) ~~~~ This will leave your name and date/time.
But, seriously, the work you've done is far better than most profiles. I am a terrible nit-picker, but then again, you asked!
As far as how to proceed, I have no idea. I've only just begun to break through brick walls through DNA, but then again, that does involve other people helping out.