I can say for sure that the BI settings for movement speed and kill speed is the best, its the same as MTW only difference is that BI archers are more deadly and effective.
Problem lies in AI and has alway been that, charging archers into combat, attacking one at a time, suicidal generals and cav is the real issues. You can modd kill speed/movement speed as low as you like, increase morale as high as you wish but that will only offer slow battles, not tough battles.
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