Yeah Joe, I have no problem with your logic that you like your chances if your up against a small pair, but right here I think the Risk exceeds the reward by far too much. And as you said, I think you also got caught up in the notion of the need to defend your blinds. For one I think defending your blinds is more important in a cash game, than in a tournament. In a tournament, I honestly think you should only be defending your blinds to minimum or weaker raises. going farther than this with marginal hands to big raises will get you in a lot of trouble (unless you have a serious read) but enough of that.
What it came down to was, did you honestly believe that he had a low pocket pair? Your really putting your reading skills to the test here when its not really needed. As you said in an unraised pot to him he's gonna push with ATC and for the most part thats not your problem to worry about. Its unlikely he'll have less than a queen high here if he doesnt have a low pair with 10 bbs. Even if he has a low pocket pair, your hand is still unmade. Your calling off 19,000 chips total, that you gladly could have thrown away creating aggressive image.
Alien said it best, this is the time when you should steal and let your blinds be stolen. Its going to be no problem for you to get your bb back with your stack size. What I like to do when I have a stack like this, paying attention to time of levels and position, I like to avg a one steal blind per orbit, sometimes I might take an orbit off and steal 2 on the second orbit, it all averages out.
I think you just got mixed up in the notion of protecting your blinds and that swayed you to think that he had a low pocket pair, giving you reason to call with overcards, but at the end of the day, whether your read was right or wrong, The risk greatly exceeds the reward. In fact If his stack was only 8 gs I still wouldnt call for 6 gs more. Its too important to keep your stack as big as possible for a double up even though your second place.
Think about whats worse Joe, you have mr ATC pushing in the cutoff on your blinds with his small stack of 20,000 or mr ATC in the same circumstances after he has doubled up through you and has about 45,000 chips to your 100,000. Not only have you put a battery in his back but now, in the event he pushes all in, and you call with a dominating hand like ak, say he has aq and he hits the queen, now his stack puts a huge dent in yours. And though you make the right call there the unfortunate circumstances favored him. If you hadn't doubled him up you'd be losing the original 20,000 just to call him and be at around 100,000, in this case you'd now be around 55,000. This situation really happens.
With a player like this that aggravates you, when I have a big stack I never give this person any type of chip momentum because once you do he is going to be a serious thorn in your side when he gets chips as long as he is sitting to your right, and if you think you have to worry about defending your blinds before it'll get even worse when he's got more chips.