I think you're missing the point. You are making a parody of a perfectly viable and realistic medieval setting, where each of the Dukes are/were competing for the throne. Being a King is the ultimate position and it is only natural that the candidates are plotting, scheming and doing all in their power to climb that ladder. Their vassals support them, knowing well that probably a reward is somewhere along the road, which creates rifts and lack of unity that was planted probably years ago. Big realm, several strong Dukes, all vying for power. It is a perfect medieval simulation that makes the passing of the Crown a risky and dangerous transition as secessions and rebellions are most likely on the verge. I don't see anything wrong with it and like the realistic approach behind it.
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