I couldn't find any connection to the Doidge names you mention from Tavistock area, however let's not rule out a connection as my line came from Devon / Calstock area.
My connection to Mary Lucy Chilcott is that her husbands father, John Hancock Doidge was my gr grandfather. Sixteen years after arriving in N.Z. he re-married. I stem from that marriage. I will continue to look for Amelia etc..