What kind of master race are we talking here.
More intelligent kind, or health wise.
I'm pro genetic engineering but I'm not willing to wipe the face off Humanity and turn it into a factory that cannot process emotion.
With intelligence come a possibility of growing a larger starfish. But growing and engineering a civilization that can withstand diseases is okay with me.
Edit: I agree that a smaller society will be easily controlled, and comes the possibility of educating it equally as a base.
This way stereotypes of races will not emerge based of racial tension and oppression 90 years ago.
I even have plans of cities shaped like cells.
Energy development is in the center.
Education centers in outer first ring.
Stores in second.
Homes, and areas where people live and populate,
And then an agricultural area on the outskirts.
All of this does not define a super emotionless race that depends on calculation.
It's just an organized superior society.