Try one of those you found most difficult to get right. For me most work very good, although some (like suzuka) seem to have slipped through.
Well I already put mine. Could you try? For example the lap times @ Montreal are slow in my mod. I tried to improve it but I couldn't do it very good. You can also try Monza, as it's a track without many corners. Just drive with for example Button behind the race leader (~half a second behind or even a full second) and just drive behind him and watch. I did 3 laps races. Try to be 2nd. Behind the leader. And if the leader is Massa, then you should let someone pass so you can look at his time because Massa is slow.. Just don't let them to have to block each other because they'll lose time this way.