Welcome! You're in the right place. Look above you'll find the set up sheets right here in the forum.
Direct link:
xsheets.phpRecord your setups and look at other guys' setups. Team drivers and everyone else has their setups there. Some are featured for the rest you'll have to search manually.
As for astro I haven't raced on it but we race on grass often so maybe my setups might give you a hint or two. What I would recommend is to lay the shocks down, harder shock oils and thicker sway bars. But I'm sure the UK guys will have even more pointers.