Last attempt.... Had a wander around and came across an aerofoil that fitted to the back of a wiper to add to the pressure upon the blade but it was in the US, so discarded that idea... Then found these with a broader backing to the blade which might just help a bit... ?
https://www.ebay.co.uk/itm/187403024139?mkevt=1&mkcid=1&mkrid=710-53481-19255-0&campid=5339129536&toolid=20006&_trkparms=ispr%3D1&amdata=enc%3A1kZkdhBHeQ8Cc2Pywt9duNg24&customid=e3a401fa8e321e246457687993e09944&loc_physical_ms=41949&loc_interest_ms=&msclkid=e3a401fa8e321e246457687993e09944
If the link does not work you could try ebay search for
Windscreen Wiper Spoiler Front Blade Bloom M10 300mm / 12'' with 10 adapters Car
https://www.ebay.co.uk/str/carmaxaccs?_trksid=p4429486.m168239.l149267
