Try the UK telephone directory for Northern Ireland and look for places close to Comber. Its amazing how many families still live in the same areas.
Comber - Parish Shankill, Poor Law Union of Belfast.
1860 Griffith Valuation:www.askaboutireland.ie
most Shaw's appear to be in the Shankill Parish and in the town?
Index to Wills, Gertrude Thrift collection 1536-1858
Charles Shaw, Dromore 1822 Lisnafiffywww.dromorediocese.orgwww.downanddromore.org
The Northern Ireland telephone book.
Adair - Comber - gives Newtownards? or Comber, Newtownards. Same for Shaw & Morrow. I would stick to writing those with Comber specifically in the address as it would reduce the number of letters you can write.
The BT telephone book give postal codes as well as addresses. Sometimes writing letters will get you some responses while you wait for replies about the family from family. They may not know much but might be willing to help look. Also social media works well for this purpose.www.emeraldancestors.com
for Northern Ireland baptisms&marriages. Free to viewwww.rootsireland.ie
a not for profit but fee paying website.