Reinforcements Delayed - Settings Already Changed

I'm getting consistently 'reinforcements delayed' event in battle (in the most recent case, for the enemy.)

My unlimited manpower thingy in the EB2 cfg file is already set to 1, and I'm able to run the game on consistently high settings.

I am playing on a mac through Steam, but I've not had this issue in other Total War vanilla iterations, so I'm not exactly sure what to do.

Try it with your main M2TW cfg, it sounds as if your value in EBII's is being overwritten from there.