You're right, there is more of a colour mismatch when using the high-res textures in the carpark. I've had a bit of a go, but still can't get things looking just right. There will be a better version in the next Blackwood update, for sure.
Also, I checked out the AutoX map last night, and it really needs some serious work. It's also the track I'm least interested in working on, so I won't give a definate answer as to when it'll get done. I put it to unseen the other night that we should do an AutoX update, but now after having a look I'm a little uninspired! lol.
Having said that, I'm really happy with Westhill now- I've ignored it all this time, and now it's become my favourite track. Maybe the same thing will happen with the AutoX... I do love cruising in the MRT there that's for sure.