Bugger. I was really hoping double tests for romans would be the explanation for the double awarding "feature". There's no good way to mod around this one. Doubling the threshold prevents the AI from leveling up appropriately, and God knows it needs all the help it can get. Halving the odds for each comabt trigger would be slightly better, since it would tend to keep AI and player generals mired down in mediocrity, but where's the fun in that?