I'd start with the middle hole on the shock towers and outer hole on the wishbones, both front and rear.
Adjust the diffs by removing them from the car. Hold the diff using two allen keys or spanners (basically anything that will fit in the outdrives) going across the outdrives to prevent them turning. Test the slip by trying to turn the diff gear.
Generally you want the front diff a bit tighter than the rear; gradually tighten the front until the gear doesn't slip. Tighten the rear so there is still a bit of slip (but it shouldn't turn easily).
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