At a recent astroturf meeting Nick and I ended up on VERY similar setups except that I ran the front shocks in the outer hole in the wishbone with no other changes.
I believe that was very close to Nick's astroturf set-up and if you like a slightly more gental / less agressive car it might be a good 1st change.
We are always here to help, just ask ... I'm sure you will enjoy the ZX5-FS, it's a really nicely balanced car