Heya,
Congrats on the car. I dont have answers to any of your questions, but I will ask you to join
www.matrixowners.com . Some of our members are on here too but you'll get a quicker response there.

Also, you can come out to the West End meet this Wednesday and meet everyone. I'm sure they can answer your questions better if you're there with the car.
Lastly, since its an XRS, you absolutely have to push the car all the way to the 8200RPM redline (first or second gear is best)!!!! You'll see what I mean when you pass 6200RPM :P