Your consistant which is good and nice and smooth aswell. Only things I could see (im not particularly fast or indeed anywhere near good. Im just coming back into LFS) are coming onto turn one you dont use all the the track when coming out of it. You kind of try and stay in the middle of the track, Unless it is a trait of the XRT and is a better way? And coming along the back straight, it kind of turns a little to the right. I 'usually' try and take this from the middle of the track and come in slightly and use it to go upto the turn.
Apart from those 2 small things (and there not exactly much really) it all seems good from me.Try braking a bit later at some corners maybe. T1 I know you can probably stretch a little bit off there.
But once again I must stress I am not good and just sayign what I see and may well be wrong.