I have finally found
@Salty seadog route from Deal to Dover though i stopped at the coastguard station but got the gist apart from the bit that comes down near the docks. More research needed on that bit.
I would not fancy doing it Dover to Deal between Dover and the Coastguard

but after that it's downhill all the way to Deal
Now to find as nice a route between Dover and Folkestone and then i may just have my route to Rye sorted.
@User10571 did mention a Kent coastal ride from Rye all the way round to Dartford. Reverse that route and it's mainly downhill, much more appealing.