So, let's look at what could be done. We know that the height of the steerin rack is compromised by the bellhousing, and given that MMC have chosen to place the rack behind the engine, this cannot be lowered in height. I understand that using large narrow wheels does not help either.
As I understand it, the track rod ends really need to be horizontally parralel to the ground and the suspension arms, it is either a matter of raising the steering arms on the upright, a production mod, or fabricating a spacer between the track rod end and its' fixing on the arm. This is what I understand Williams are working on.
The only other thing to do is to lower the ride height of the car, by moving the spring seat or having shorter but stiffer springs, possibly not to difficult to do, if some adjustable platforms can be fitted to the dampers. This may also change the geometry of the front end too, certainly the toe can be reset.
Other than that, I cannot see that the design can be modified any further, and playing around with shock absorbers and spring rates is more a means of masking the inherant problems with the setup that MMC are forced to use by the layout of the front end.
Having said that, when Autocar magazine tested the car last year, they praised the steering very highly, and there was no mention of the current problems, so, it would be interesting to know why that car was different to the current production cars?
