Those spring rates sound about right for dirt, but soft for tarmac. You want to use full travel in the dirt with minimal bump stop impact. You would know if you were bottoming out too much.
What do you have in the way of sways? I would be tempted to soften or disconnect the rear based on what you describe and maybe drop the rear to 1.5 or 1.0 degrees of camber but I am not a dirt expert.
How are each end of the car wearing tires?
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