Like Bill touched on already, these steering systems are just inherently prone to lots of compliance. Not sure what team you are working for, but take a look inside your pumps and see how "stock" they really are. Lots of R&D work has been done on them already just to get them to the level they are at currently. Ultimately I think it's why so many open wheel drivers struggle in stock cars, you really can't trust what your hands are feeling most of the time. Which in a good open wheel or prototype car is not the case.