I don't remember any tire temperatures, I did my last laps at Darlington half a year ago...

The setup is tight indeed, that's the only way too avoid getting loose out of turn 4 with worn tires (I'll probably adjust the shocks before my next race here, that might help a bit, but I'll still have to use a pretty tight setup I think). I can't tell you what's different about our lines of course, but I think you might enter the turns a bit too hot and get back on the throttle too early (i.e. before the nose has started to turn down towards the apron).