Start with a close-up of the engraved feathers between the eagle's right (viewer's left) wing and leg.
Compare it to a VAM33. Double eyelid, double B. http://ec2-13-58-222-16.us-east-2.compute.amazonaws.com/wiki/1878-S_VAM-33
You need a copy of "The Top 100 Morgan Dollar Varieties: The Vam Keys by Michael S. Fry, Ph. D and Jeff Oxman [ISBN 0-9653645-4-2] This should help you on any others later. Do not know if a newer updated book.
I think you may have the obverse die correct but the engraved feathers and mint mark location are not a match for the reverse die. Try VAM-42 instead.