Chris have a look around for either one of mine or NJC11 (Nick) setups.
Generally we have a very similar car other than I like a stiffer spring in the front to Nick (personally find the car a bit more predictable / easier to drive with a slightly stiffer spring).
If you can't find one (try Petit RC too) then get back in touch, we'll be happy to help To be honest though there are only very subtle changes between the grass and astro setups so start with what you. Come find us on the day and see what we are running