Are you using it to band-aid for different injectors - or just to fine tune your AF?
If it's being used just to 'fine-tune' say +/-4% what does it mess up? My total ignition timing did not change more than 1* as measured by conzult when using the AFC at 0 vs. +/- a few %.
I think AFC's get a bad rap from people who don't use them properly, or don't understand what they do.