At my age anything faster walking pace is just a blur. Whiskey doesn't help it either. Shame really as I love belly dancers and lady streakers!
If the motion blur is limited to only in the cockpit it could be that you need to change the World Movement in Options/Advanced/... the higher the number the more shake you get so lower the number. I have mine on 70%.
If that doesn't work make sure that all the screws and nuts and bolts in your driving chair are really tight.