No, HIGH officials are Apostles and members of the Council of 12. Bishops are pastors of wards. Stake presidents are in charge of the Bishops of all the wards in each stake (something like a diocese) My dad was a stake president, for instance, and a bishop. But he was NOT a HIGH official.
"Romney was a Stake president, and a Bishop, I believe the only above him was the 12 Apostles and the Prophet himself. As Stake President Romney was in charge of one of the 22 districts."
See above.
Having 13 people above you as Stake president, and another 22 or so if you are a Bishop, sounds pretty high up for an international organization of millions.