Folding AKo Preflop

[StewiesMinion]

Playing 8 handed (about 35 players left) in a live tournament full of bad players. Blinds 200-400, average player has about t5500.

I have a very tight image, t8000, and in EP get dealt
A [img]/images/graemlins/spade.gif[/img]K [img]/images/graemlins/diamond.gif[/img]
I raise to 1200

CO goes all in for 2100
BB goes all in and has me covered.

I go into the tank and decide that the CO likely has A-rag and the BB has a high PP and I muck the hand.

Would anyone else muck this hand and was it a bad move or just marginal?

Results in white:
<font color="white">My read was close I was against A7s and TT, Tens hold and would have held against me. </font>