You have a personal definition for evil, like everyone else. Many people have definitions of good that include things you see as evil; some of your goals are in conflict. Taking that into account, how can you precommit to implementing the CEV of the whole of humanity when you don't even know for sure what that CEV will evaluate to?

To put this another way: why not extrapolate from you, and maybe from a small group of diverse individuals whom you trust, to get the group's CEV? Why take the CEV of all humanity? Inasmuch as these two CEVs differ, why would you not prefer your own CEV, since it more closely reflects your personal definitions of good and evil?

I don't see how this can be consistent unless you start out with "implementing humanity's CEV" as a toplevel goal, and any divergence from that is slightly evil.