I'm not sure but it seems like you have a lift and bigger tires. On an torsion bar set-up, since the front end is basically a lever with the torsion bar acting to "push" the suspension down, wider tires will change the dynamics of the suspension. Just like on any lever the further you move from the fulcrum the less energy is needed to move the lever. Applying that on the suspension, the wider tire moves the end of the lever out and reacts with the torsion bar more aggressively. So, a bigger bar should be advantageous when you have a bigger tire (especially wider). Add more weight to the front end with something like a winch and now you have more weight creating more moving energy when the suspension is working.
I would think one of the lift companies or someone like that would have more aggressive torsion bars for this reason. That would be the first place to look.
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