Welcome! I have ancestors from Tyrone also and have not been able to find anything online. Mine may be the same time or a little later. Also, you should explore the possibility that your ancestors were Scots-Irish. Early in the 1700s Scots were persuaded to migrate to Ireland with the promise of better farming, etc. would be better, but it wasn't. So many emigrated to America. I have one ancestor that is listed as Irish on some census records and Scottish on others. I don't known if it is a mistake of the census taker or what. Just something to look into. I don't know if the name Denny is Scottish or Irish, maybe you do.