I think what needs to be pointed out is how the ride height and the resting angle of the wishbones affects how the suspension reacts to bumps, for the suspension to work as it should the lower wishbones should have at least a degree or two of up sweep to them. By this I mean the wishbones pointing up away from the chassis otherwise the spring has no preload and makes the ride bouncy and not shock absorbing. If you use a spring that is too hard you are trying to break the suspensions back rather than it being complyent.
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