River value spot

[FiSheYe]

Definately not less than 3/4pot but as described with UP dynamics/betsizes betting pot looks almost the same (especially if he doesn't know you are CTS but perceives you as a loose Lagtard/Maniac).
We could make an argument for overbets or shoves but with the provided information I have trouble to estimate a calling frequency so I cannot tell which one offers more expected value.
C/R seems awful if he is almost never bluffing but might call big bets loosely in that spot.