Isn’t making the max. hitpoints reduce to chance to be stunned an option? High hitpoints could represent the resistance of a brother against status effects (stunned, posioned), thus making hitpoints a little more viable, once a medical system has be implemented. Or that’s at least how it works in many RPGs.
Anyway, having the stun chance decreased by shield and shieldwall bonus doesn’t seem enough to me. Have any stat influence the chance as well, so you can directly develop certain brothers to become more robust against stunning.
Perhaps to add more significance not only to armor but perhaps to initiative aswell, it could be the bound stat for stuns. The faster you are compared to the enemy, the more chance you got that he can not react in time.
The hp aspect is a very fine one aswell. As stated more times already, I’d love to see more stat bound skills, and if instead there are game mechanics well even better. The current stat trinity must be broken, and diversity has to dominate giving the player even higher character management options or even so to say manual specializations.