Hi Dennis,
I've had exactly the same issue on my ex grad roadsport, and have just had a full geometry setup carried out to convert the car to road use.
Before, the set up was a balance between road and track somehow.
Although I do a bit of track driving, the car was noticeably toe out, and was wearing from the inside of the 13" Toyo 888s. I haven't had a chance to use the car in anger yet, but it crtainly feels more planted and at home on the roads, and less twitchy on the motorway.
I had the work carried out by Automotive Engineering, and can highly recommend their work and attention to detail if I'm allowed to on here.
In retrospect, I should have had the car set up properly ages ago, hope you get yours sorted soon,
Matt