ok this is actually some of the best discussion i've seen here in a while.

i am not completely sure of his 3-bet range in position, but my guess would be:

TT+, AK/AQ close to 100% of the time.

other pairs/big cards/suited connectors some of the time, but probably not all of the time.

i chose to CR all in on the turn. i know it's tough to get called by worse.....but i really felt that i would have an impossible time on the river, and the pot was growing large anyway. and if he folds, it'll plant a tiny little seed that maybe i bluffed him off a big pot. i thought there was also some chance that he calls with AT or a draw. i really didnt expect a big pair to fold here given our history.

anyway he folded pretty quickly. it felt nice.