Why not build it as per the book and then see how it performs first before following someone else's suggestion?
I've yet to build my SC10 4x4 but have in the past run the 2WD version - the stock tyres (same as the 4WD) were great until they wore down a little on the rear, then were replaced by Kourse kings - the front tyres stayed stock for two seasons - indoors on carpet and outdoor on astro.
I tried various options and basically went back to stock everytime.
When I build mine I shall set it up book standard and race it a few times before I start changing things -
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