cars do change when moving to cp,but only in the cp 2,4,6,8 because i think the author added a car randomizer script to his nts map instead of replacing race to nts on meta.xml.
Server: Mix Map name: NTS-Intosewers Reason: just a 45sec nts where players get stuck( after getting a truck) under some kind of bridge,causing a huge chaos and blocking the road for others.
I'm sure you just want to play on mrgreen just cause of Shooter and DD,there are alot of server thats has these gamemodes just like kali said,and also i still remember an indiand guy that used to play on mix server on 140 ping (he's banned now) so maybe it's your network that is so bad.