Drivers side footwell vibration

I'm at a loss I have heavy vibration and rubbing/grinding that can only be felt from offside footwell. It is always there but becomes more pronounced from 70 upwards also getting a knock from front over uneven surface.. I have completely rebushed the front. Shocks all round wish bones done both sides. Tracking done on Hunter wheels balanced on numerous occasions. Tyres front to rear and still the same. Been at Skoda and they can't find anything wrong with it . Driving me insane. Dsg clutch packs and flywheel done twenty thousand ago. I'm a cab driver and I'm on the verge of changing it. Mileage 165000. Please advise.