You have done well already, If you want keep opening up research lines, i recommend three sites for Sloan(e), the kennedys have even more
comberonline.org open history section, open and download
the historical directory which contains information not for commercial use
Sloan Agnes Crossnacreevy Down: North Moneyreagh Moneyrea Orange Hall Ulster Covenant 1912 in
www.proni.gov.uk Sloan, Andrew, Ballycreely , D/654/A3/1B, Freeholder in
www.proni.gov.uk Sloan, Anne, Jane, Moneyrea, gh,Householder in Griffiths Valuation ~1863 several websites have details
Sloan, David, Ringway Ringcreevy Comber, Belfast: South, Saint Anne's, City Hall, Ulster Covenant 1912 in
www.proni.gov.uk Sloan, George, Ballykeel,Householder in Griffiths Valuation ~1863 several websites have details
Sloan, George, Comber, Down: North, Comber, Square (The), Ulster Covenant 1912 in
www.proni.gov.uk Sloan, Isabel The Clattering Ford (Poem) County Down Spectator 26 Jan 1957 p.10 with acknowledgment to The Education and Library Service of the South Eastern Education and Library Board.
Sloan, James, Ballybeen, D/654/A3/1N, Freeholder in
www.proni.gov.uk Sloan, Jane, Miss. Comber of Ballymaglaff; B, Abt, 1785 & Married John Kennedy Abt, 1805; Mother of John B, 1806 & Margaret B, 1808 & James B, 1816 & Martha B, 1818 & Robert B, 1820; D, Ballymaglaff RAJ G7, freepages.genealogy.rootsweb.ancestry.com/~rosdavies/
Sloan, John, Ballystockard, D/654/A3/1N, Freeholder in
www.proni.gov.uk Sloan, John, Ballystockard, D/654/A3/1Q, Freeholder in
www.proni.gov.uk Sloan, John, Ballystockart, D/654/A3/1B, Freeholder in
www.proni.gov.uk Sloan, John, Market Street Com’,Householder in Griffiths Valuation ~1863 several websites have details
Sloan, John, Haw (The), Householder in Griffiths Valuation ~1863 several websites have details
Sloan, Mary, High Street Comber, Down: North, Comber, 1st Presbyterian Church, Ulster Covenant 1912 in
www.proni.gov.uk Sloan, Robert, Ballyrush, D/654/A3/1S, Freeholder in
www.proni.gov.uk Sloan, Robert, Ballyrush, D/654/A3/1X, Freeholder in
www.proni.gov.uk Sloan, Robert, Ballyrush, T/761/19, Freeholder in
www.proni.gov.uk Sloan, Robert, Ballyrush,Householder in Griffiths Valuation ~1863 several websites have details
Sloan, William, Ballyrush,Householder in Griffiths Valuation ~1863 several websites have details
Sloane, John, Ballystockard, DOW/5/3/2, Freeholder in
www.proni.gov.uk Sloane, John, Carnasure,Householder in Griffiths Valuation ~1863 several websites have details
all the websites quoted should be looked at and updated for morre possible information.
The most fun for you will be
http://griffiths.askaboutireland.ie/gv4/ where you will be able to see the actual place each Sloan(e) lived.
The 1911 Census on line
www.census.nationalarchives.ienow shows about 19 or 20 Slaon(e) just for Comber civil parish so apart from Comber as a heading, where you should find the Streets, also use Ballygowan Town - Ballygowan , Clontonakelly - Drumbo , and Ballykeel and Ballyrush in Moneyreagh DED
Lastly without knowing the location, there is a family tree in manuscript for SLOANE in volume 5p192 in the Blackwood Family history manuscript trees in the LinenHall library, Belfast. Blackwood normally researched just Co Down families. I suggest if you cant visit you ask them for photocopying estimates if they think your knowledge relevant and you should be prepared to pay a fee for copying, post and packing, and perhaps some staff time and overheads. However if the material is really relevant when you get it, I suggest a further donation to this unique library that is always needing extra funds and because you have acquired a copy of a valueable family tree.. Linen Hall Library,17 Donegall Square North, Belfast BT15GB, Northern Ireland, Telephone: +44 (0)28 9032 1707, Fax: +44 (0)28 9043 8586, Email: <irish.reference[at]linenhall.com>.replace the [AT] with the symbol please
I can give you the Kennedy volume references if wanted
good luck, Jim