I know that they were there in 1841 and I have also found archives placing them there in 1824 William Hunter Schoolmaster Newmill Dalry.
I have not come across any of your Hunters yet but then I have only started looking into my Hunter side in more Depth.
I have them there until at least 1860.
Going by census's, the only son I have found for William Hunter and Jane Gracie is Kirkpatrick Hunter who was born abt 1838 Kirkcudbright.
and the earliest child I have is Helen Hunter born 1817 Kirkcudbright.
They were in Kirkcudbright as early as 1796 wether or not in Dalry at that time I am uncertain.
My Dalry Hunters
William Hunter (b:abt 1796 Kirkcudbright d: 12 Apr 1849 Dalry, Kirk) and Jane Gracie (b: 1794 Keir, Dumfriesshire d: Jan 16 1860 Dalry, Kirk) (have never actually found their marriage)
Helen Hunter (b1817 Kirk)
Janet Hunter (b 1823 Kirk) marr Hugh McCulloch
Agnes Hunter (b 1827 Kirk)
Jane Hunter (b 1832 Dalry, Kirk) married David Loudon
Marion R Hunter (b 1834 Kirk)
Kirkpatrick Hunter (b 1838 Kirk)
I have found a marriage for a Kirkpatrick Hunter to Elizabeth Hamilton in 1860 at Edinburgh, Scotland, Wether or not it is the same Kirkpatrick I do not know.