How "stable" is your car on the open road???

[Plums]

I have just had my car in for a wheel alignment, and the car still feels nervous on the open road. The car feels great at around town speeds, but out on the highway it tracks (I think that's the term) quite badly. It feels as if someone just randomly gives the wheel a little tug in either direction.

Here are the Front figures:

Toe: .1 toe out total

Camber: -1.5 degrees (both)

Castor: L 3 degrees, R 2.5 degrees

When I got there, I had 3.1 toe in total and this was the only thing he adjusted. I queried him on the toe out but he assured me it was all good... He reckoned the camber was good, and the castor was also good (but I know I have the castor at the max anyway, unless I start modifying things).

The Rear figures were:

Camber: L -1.5, R -.5

Toe: L 1.4 toe in, R 2.8 toe in.

I just got the figures for the rear and I'll have to play with it myself, (I need to remove the tank to get the lower arm link out to take out some toe from the drivers side)...

The guy reckons just one shim in the right will bring the toe to about spot on, and will probably get the camber close to the left too....

Any help or comments would be welcomed....