Well, have just got around to this job and having replaced the wiper mechanism with a spare of the Laird's the issue has been resolved. On taking mine off one of the joints which appears to be a pressed ball and socket joint just fell apart. So the slackness in the mechanism caused by the wear in that joint was enough to allow too much sweep on the blades. 
I'll see if I can get some photos but the Laird has my old mechanism for he spare motor.
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2002 D2 S8 – Ming Blue, Valcona leather, Vavona wood insert, solar sunroof (to be fitted), Heated rear seats, extended leather pack, 18” Avus, ski hatch, Bose, auto dim rear view mirror, rear blind.
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