Hard to say without knowing if you drive on a track or just bash. Indoor or outdoor track? Loose or high grip track.

If you drive at one of the tracks near you, find out what tires their running. Ask a guy with a sc10 4x how his truck is setup. Download an AE setup sheet with a track description like yours.
You can look through these and see if there is a track condition like yours.

http://www.teamassociated.com/setupsheets/SC10_4x4/