look up Kev Lee's car in this or in the other website and you will see photos, he is using losi shocks/springs on the rear...
http://www.the-pred.co.uk/coppermine..._display_media
Maybe BB's (kyosho or ae) could have been advantageous?
This was brought up previously in the other thread also, but as MHeadling said, it didnt work... and the car was apparently better standard.