Setup for thick Astroturf

[geckster]

The heading says it already, I need a good setup for my 4-gear X6 for our Astroturf track. Already been looking in the setup corner but didn't find something for me. The track is rather large, has a 30-40m long straight, some tables and jumps and two 1,5m high steep turns and has plenty of grip.
Motor is a LRP X12 5,5 Turns, with the damper oil I started at 35 at the front and 30 at the back, tires are Schumacher Minipin yellow at front and rear.