Ogre rage working properly?

[Zechnophobe]

Damage caps out once you have 60 greater attack then the targets defense. It is quite possibly that your attack stat was pushing your ogres to the point where the rage wasn't going to give any more additional effect.

I have used Ogres, and am pretty certain there ability works as expected.

Note that you will get the most out of them when using the rage ability against higher level units. Against dragons you will often get the most damage differential (Potentially many times more damage than otherwise).