Try this site it may help
http://www.petitrc.com/reglages/SetupSheetDataBase.htm
I run nearly shock set up, apart from softer shock oils, bigger piston holes and 3mm Xray front anti-roll bar works well.
If the astro is very high grip then you'll need to tune the tyres, cut or dremel them to stop grip roll. I like Schumacher yellow mini spikes all round with hard inserts in the front two outter rows cut, one inner and med's inserts in the rear no cuts. Not quite as fast as mini pins, but alot easier to drive.