I would have to agree with Burns.
Consider the extremes. Lets assume that in the kingdom, player R has the greatest win-loss difference, of about -3k(3k more losses). Since everyone else is more balanced than him, everytime he attacks for wins, he gains negative honor. By the time he reaches balance, his honor would be extremely low(if he gets -400 honor from a balanced player each fight, I calculate -100k+ honor). The only easy way for him to ba on track is to have 'in' attacks where he would win(and 3k of those). Consider also that in those 3k fights, he would gain nothing.
For the balance problems of the MP5s, the best solution I can see is for the new generation to start the adjustments.
I also have another idea, ind it would involve the guilds and their members. Since guilds can recruit MP3s and MP4s, whom are more overall more balanced, why not use them to farm honor? (Of course 'use' is rather impolite and disrespectful both to the guilds and the persons) So, MP5 guild members will farm wins, to be balanced, on other MP5s, then farm honor on the MP3/MP4 guild members. If most of the MP5 guild members are balanced, they can then help other MP5s in balancing themselves.
The problem I see in this is that, other than it takes time, is thet the oneness of the guilds will be hurt. In the subject of recruiting more lower MPs on guilds, I'm pretty sure there are deserving people among them.
I'm sure my idea would work, as long as everyone cooperates. I think cooperation was the root of the problem anyway.