The advice the Morrison DNA Project Administrator gave you is excellent. He gave me the same advice and I followed it.
The scenario you describe is best summed-up by a quote from the Morrison Clan page of GeoCities.com :
After the dissolution of the Lordship of the Isles in 1493, life in the Hebrides, including Lewis, became much more turbulent and violent. At the end of a series of inter-clan struggles extending back for more than 100 years, the Chief of the Clan Morrison and his six closest male relatives were murdered by the Chief of the MacLeods, who obtained letters of fire and sword against the Morrisons from King James VI. The Clan Morrison was thus broken, and remained so for more than 300 years.
Having gone through the same frustration; I sympathize with you.
Felix (Fil) Morrison