Haha hi! Yeah you were up with me and then gone, I didn't see the astra's cornering "ability" else might have hung back with you! He had the edge on the straights but didn't have the confidence in the braking.
I thought perhaps your rainsports (or did I see wrong?) had overheated. I used to have some on mine and didn't get on with them so went to PS3s, much much much better.
Not sure about the whiteline, it certainly increases "bite" when turning but once the wheel is good and cocked I don't know if it can make any difference?