Hey I got a chance to run tonight, and i tried a change with the width of the car. So since we're on the subject, I had some sucess with a slightly wider rear end than front. I removed 2mm total from the front end. This helped the steering a lot. I know a lot of guys had a similar result when they narrowed the front of the XXXS, so that seems consisent with tthis result.
front = about 186mm
rear = about 188mm