Hi Chota
I am not researching this particular line of DUNK genealogy, so I can't be of help BUT 'I know a man who can'.
Regrettably he is not on the 'net, but I wrote to him and I got lots of info. on my particular enquiry. He maintains a one name collection on the name of Dunk, which I think he has been researching for years. If you are willing to write, get in touch and I will forward his name and address, he's a mine of information or alternatively I know he is a member of Hastings and Rother FHS, you could try them.
Regards
Clazy2000 (Gill)