Do you have a cite for your claim that half the Refs are from Alabama. That seems unlikely. And wouldn't moving the SEC office just create a new bias?
The SEC does not allow refs to call games involving a school they attended, a school their spouse or children attended, a school that employs a relative, a school where they have a business relationship, or - if the ref is a former player - a team that employs a refs former coach or teammate (during the Croom era there were a couple of former Bama players who could not officiate MSU games).
Hometown and home state are only considerations for the SEC Championship game.
Refs make bad calls, and it is only human nature to assume there is bias. I believe Hanlon's razor applies: "Never attribute to malice that which is adequately explained by stupidity".
What is a more attractive television product: A league where upsets are always possible, or a league where just 1 or 3 teams win all the time? SEC football is an extremely valuable television commodity, and only a fool would risk losing that money - along with likely jail time - by manipulating the outcomes of games.