i like your idea of posting in detail your logic and reasoning on every street and how you attempted to deduce information about your opponent. i can't see a multi-tabling nit shoving over you on the river here with any hand which doesn't have you crushed. if he is the "clever" type of nit who likes to float and has high turn AF's, most of them in my experience dont bluff bricked rivers unless you let them (ie if you checked to him). i honestly cant see much merit in bettin this river at all, as he doesnt call with anything that you beat that i can think of, or fold many better hands.