The worst split at the top is 50/50 because it is asking for gridlock. Someone has to have the final say and that is the CEO. One of the jobs of CEO is to evangelize about the vision. If that is not quite happening, check the evangeilzing methods, check the present vision (it may be a tad off).

I have been in many businesses, including the 50/50 and now as Business Executive Coach help point a big flashlight on future success, the alternatives, the evangelizing and self checking needed etc. Not for the faint of heart, but hey, that is why you are the CEO. :-)