My Golf suffers from steering judder at Motorway speeds above 70 mph. (I live in France so its legal) If I take my foot off the accelerator it goes away but the moment I put my put back on the pwer it starts up again.

I have renewd front pads/disks. New tyres. switched back wheels to front. New shock absorbers but its worse than ever. I know the CV joints will need replacing as they crack on full lock. Could this be the problem?.