If I thought it was a bug, I'd posted it on Mantis
The reason I haven't is that I'm not entirely sure it's NOT supposed to be this way. Unfortunately, I can't tell the AI type due to me using random types, unrevealed.
But, as of yet, I have no wave increasing structures and have been hit by waves (single waves, only one wave warning) of 700-750 ships, usually a mixed bag, but that's because I'm using schizo waves.
Theoretically speaking, if one AI was a turtle type (no wave type), would the other get larger waves to compensate, or would that require something else? Also, does Mad Bomber get LARGER waves, or just more frequent?