Here is a link to what I am starting with on Sunday, medium grip astro and very bumpy track.
https://drive.google.com/file/d/0B1q...it?usp=sharing
As Roger says, we have been playing with additional weight. The DB2 is a light car, which means you can easily add extra where you want it.
I have fitted a 45g zx5 spine weight underneath the prop and added 10g either side of the slipper. Not a fan of having additional weight at the ends of the car as you end up with a pendulum effect and snappy handling.
The additional weight improved the stability on the rough track.