Kevin, I wonder if your research has included the Cushways of Bethnal Green in London. Supposedly they came from France about the same time as your Coushois. I have info as far back as a string of siblings, the eldest Samuel being born 1819. Whilst I know the name of his mother and father I am looking for the date of birth of Samuel Cushway who was his father.
Any info appreciated.
Regards, Mick Lewis........my Great Grandmother was a Cushway