I feel your pain. My light rear is too light for my bilstiens 255/70. So I am going with a lighter valving.
Try adding a bunch of weight to the rear and just see if it softens it up, then you know what you should do as far as adjustments. The front could be too soft, but the rear seems to be set for a heavier body on the back. Which gives you the kick.
Any chance you know the valving?
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