I had a very similar problem, changing the compression rod bushes and an alignment fixed it.
I found the car would wander and then feeling like slumping to the left.
To inspect the bushes jack up the front end of the car and unbolt the brace, if there are any tears they need to be replaced. I would recommend inspecting the ball joints as well. If the ball joints are fine you can can just replace the bushes otherwise you need to replace the arms.