1) blacks; blacks were not subject to a classfication, and certainly not in between jews and gypsies. Blacks had no real policy, because, fairly broadly speaking, blacks were not an issue. Though blacks did end up in KZ, it wasn't policy.
Blacks were a discriminated minority, but weren't at al where you categorise them.
Would Jesse Owens have been allowed to compete, and would aryan posterboy Luz Long have been allowed to give Owens advice which allowed him to win the long jump?
Why were the Afrika Korps then, the most distinguished troops in the Wehrmacht, and had a clean record? Why weren't racial purification orders given?
2) Mongols so high? Goebbel's line was always the "Asiatic Hordes"
3)You're assigning much too much consistancy to Nazi doctrine.
A number of Jews and part Jaws served in the Wehrmacht, SS and Nazi party, with the tolerance of the Nazis.
The SS ended up a majority of Lithuanians, Latvians, Cossacks, Serbs, Muslims etc.
A special army was formed by the Nazis, the Russian Liberation army, under Vlasov, composed majorly of slavs and such.
Reichsfuhrer der SS, Heinrich Himmler, the man practically responsible for the Holocaust, once signalled to Vlasov his "Comradely Greetings" and commended him on having fought "outstandingly well".
The German press also reported that these untermenschen had fought with "enthusiasm and fanaticism", and they wre named the "Panzerknacker" by other German units.