Hi Tom,
I do not have a Cyrus C. Graves in my family tree that fit that migration/timeline; however, that does not mean that he wasn't part of this family line (I have not followed all of the collateral lines).

I would suggest that you contact the Graves Family Association at http://www.gravesfa.org/ They have just about all the Graves lines documented.

I feel certain that they could help you the most. You really need to offer more specific information when writing such as birth and death dates/locations - spouse's name - children's names etc.

I know that there were several Cyrus Graves just in my line and anything more you can offer the Association will allow them to help you quicker - they have a great DNA project that you may be interested in if there is not a perfect match...

Best of luck with your research!
Becky