apologies for heading off at a tangent but this is TM is it not..?
Way back in the mists of time I had a similar issue on my Mini....! It does seem others suffered it too, and to the extent that an accessory company created a set of white plastic aerofoils which could be clipped on to the wiper arms and supposedly added a degree of extra pressure betwixt wiper blade and screen....I think the suggestion was that they cancelled out the effect of reducing pressure on the wiper rubbers as ones speed increased, for those of us who were really fast drivers, they were a must have.....(-:
Bosch Super Plus wiper blades have little spoilers on them, which are designed to have the same effect. I would imagine the strange Morgan size will mean they don't offer them in the format for the Aero, or any other Morgan; however, I believe the principal is the one you are describing, George
