Moonrakers Towns & Villages

I have been researching my branch going on 25 years and haven't been able to get past my brick wall. Robert A Caswell (1690-1724) came to the Isle of Shoals NH in the early 1700's He was married to Mary Perkins (1690-1784). Robert's father was John Kerswell (1669-1699) from Devonshire. He was married to Marry Mallack (1672-?) Any information getting my family farther back into England would be greatly appreciated. TIA