you can look at this certain hand from a few different perspectives.
you can look at it as a just bad luck since your move wasnt bad, and AJ most likely will lose to AQ.
also, since you say he is a "chronic raiser", why raise so much with only AJ?
you raised an amount which in my mind is leaving you stuck with only one move after the flop, ALL IN.
you leave yourself with pretty much no margain for error if indeed you are behind in the hand. i dont mean to be critical however AJ isnt all that powerfull, especially against a big stack like his.
also, i noticed you mentioned this guy raised UTG, which already should have been a warning sign.
Big stacks raise UTG when they dont want anyone to enter with a speculative hand, something nice like a medium suited connector.
they raise UTG when they have a big hand, yet still fragile, meaning a minimum of AJ and possibly AK. perhaps he would have raided with a pocket pair of 6's.
whenever i see people limping UTG, i usually see them reraising or going all in pre flop, unless they are donks and what not.
this guy raised a considerable amount, letting everyone know he has a nice hand, not huge, but certainly strong. i cant see him raising UTG with nothing, thats just taking a bad risk.
i have one question for you....
what do you think would have happened if you would have raised to 14000 or 18000? how do you think the hand would have played out?
i just want to see your opinion seeing as i have an idea but it is more of a player personality type theory concerning this hand.