If I'm reading that correctly it is only using spacers in the rear. If the current spring rate is inadequate this is not ideal. You need a spring to handle the load you carry.
I would also question the addition of front bumps, are these required because the shocks are too long or as an easy way out from creating the required guard clearance? (irrelevant if overall travel is not a concern, but I can't see the point in limiting travel unnecessarily)
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