Suspension preload

I’ve been breaking my rear axles in glamis. Both times were on the sandy whoops. At first I thought I just had bad timing with the throttle as the rear was bucking. Axles broke inside CV. Now I’m guess it could be suspension related and that the Axles broke because of the CV angles. My preload is still set at the factory settings. Top spring has no gaps and my car sits kinda high. Should I take some of the preload off by backing top spring out? How much? Same amount front and rear? Will the car soak up the whoops better?

Thanks


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