Your case seems stronger than mine.
I think the key is still to prove that you are much better than Americans with similar background and experience. Then
LC should be waived. Otherwise it will affect America's interest adversely since you are so great.
I am not sure if you have read this article.
http://www.twmlaw.com/site/resources/immigrant/immigrant9cont.htm
Some letters from govermental agencies are really helpful.
If you have no confidience, a lawyer may help.