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Family Tree DNA reportedly has more people with Ulster roots than any other company. That obviously increases the chances of finding a match. You might want to try them or, if you have already tested, you can transfer your results to them for no fee.
The North of Ireland Family History Society is running an Ulster DNA project in conjunction with FTDNA. http://www.nifhs.org (Go to DNA project on the website).
Elwyn, IrelandXO Volunteer ☘