Update on my RE003's. After 5000km, I am still very happy especially with the grip in the wet. I managed to ride in an E36 a few weeks ago with RE002's and it confirmed to me that the 003 is a much better tyre, much better dry grip, better wet grip and better feel. Sidewall stiffness on the 003 seem pretty good as under hard cornering there is very little squirm just a linear input from the wheel to the amount of turn in.
Now I probably have to put some of that down to the chassis, Olaf's kind words about my 46 are appreciated but to be fair a bit of time and effort went into setting it up and it's good to know someone else also thought it felt right.
With 245's all round now I have set the front end to be a bit softer than the rear and I am running the front anti roll bar on its softer setting. This has made it turn in very direct and if anything it can be a bit prone to oversteer if pushed to aggressively, that said I am sure E 30 owners would feel at home especially with ASC turned off.