If you removed the OEM HSF, you need to clean the old paste and replace it with Artic Silver 5 or equivalent thermal paste. Otherwise your CPU will overheat.
Few people install such a HSF on a motherboard like yours. Contacting Thermalright still is your best option. Is there anything sort of abnormal under the CPU area with that specific motherboard? I've bought a few Intel motherboards (and I still have one) and they were nicely built.