I looked at the pictures FastLane is providing in their parts catalog and it looks like the Bosch wireset has the word "copper"
on it, which is missing on mine.
As I have no scope, I can only do limited testing. Based on the MB test routine (15-540 on the CD) the spark plug connector should have resistance of 700-1300.
I just find it "surprising" that after only 12,000 miles all are above 1300 with the worst only 5% above that limit.
Of course, I am glad that you think they ought to be fine.