How to cope with being rattled by the wake of a fast car?
It sounds like an unpleasant road to ride on, I'm sure you would use a different route if one was available. 

If you can feel the slipstream, to the extent that it moves your bike around, things are passing to close. Paradoxically you may find that by riding further from the curb, passing vehicles will leave you more room. 

People tend to leave as much room between themselves and you as you give yourself between you and the curb. More importantly if you ride hard against the curb, you are out of the area that drivers are paying attentions to, you become part of the background, invisible, cars will pass without having to move over, the car behind them wont see you, or notice the car in front move to pass you and so on.  

All this may sound odd, its fairly mainstream Vehiclular Cycling, . If you are in the UK there's an excellent book Cyclecraft