just a thought......i had a 1987 Merkur XR4Ti and it was extrememly sensitive to over torqueing of the the lug nuts. (ruined a couple sets of rotors because of this) i then became a member of the Merkur Owners Club of America and their recommendation was not to tighten over 65-75 lbs. this could possibly be your problem, same thing 4 lug pattern. i am very conscious of that on my 98 svt now.
