It is difficult to go back in Ireland much more than you have done already. You are very lucky to have the detail you have.
The earliest surviving offical records are the
Tithe Applotments: www.genealogy.nationalarchives.ie
There were 110 McAuliffe's in Cork between 1820-1839
Daniel McAuliffe, Dromagariffe Townland
______ McAuliffe, Sexton Townland
Whitechurch was a Parish and a townland, in the Poor Law Union of Cork. Within an area of 12 mi. from Cork City. It is still on maps of today about 6 mi. north of the City of Cork. Dromgarriff is there also.
There are many McAuliffe's in the Cork telephone book too many for writing letters. There are just 23 Holleran's in the telephone book but none in Cork. In the 1911 Census there are just two Holleran's.
Glanmire can be the name of a village and a road, the Parish is St. Anne, Shandon also in the PLU of Cork.
Tithe Applotments 1820-1839:
Holleran, John Inishannon Parish, Townland Inishark
is the only one listed for Cork.
By 1852 there are 11 McAuliffe's in Whitechurch Parish
3 still in Dromgarriff all named John, so could be one person with 3 portions of land. You can usually tell by the number of houses. There are 5 John's in all, 3 Daniel, and 3 James. www.askaboutireland.iewww.irishgenealogy.ie
you will find Cork baptism records
as perhaps more information than you have already.
You can try searching for gravestone inscriptions. Museum and Heritage Society often survey gravestones and sometimes have for sale. The Cork/local library might have these.www.igp-web.com
these resources have some church gravestone inscriptions.