Despite all the stats, how did that give you enough troops to fight the Saffarids/Abbasids/Uber Hungary etc.? I just can't see how having high stats would magically give you the Mongol doomstacks you would likely need to accomplish that so fast.
Assassination plot from the game start took out the saffarids, fired, rebellion, usurp birjand, mass holy war the counts, Abbasids focused on the Tulunids then the Byzantines took Cilicia, they took it back, and then the Byzantines took it back, their levies were constantly drained.
Hungary got nerfed, their land gets destroyed when they settle down. It gets given to randomly generated peasant leaders of the culture and religion of all provinces they owned not in de jure hungary.
I Conquered my way through the Suomenusko and Tengri rulers before I took on the Abbasids for Mesopotamia.
I basically had luck on my side as well as stats.