Hi,
I can see from Griffith's valuation that there were plenty of Stacks (some called John) recorded around Listowel during that time period -- http://www.askaboutireland.ie/griffith-valuation/index.xml?action=nameSe...
Griffiths also lists family members so by cross referencing with your own data you may be able to expand your family tree.
It also might be worth getting in touch with Listowel Historical Society - https://www.listowel.ie/listing/listowel-district-historical-society/. They will have local experts who may be able to help in your quest.
Good luck!
David