It is better to x/fold when you see no worse hands calling you and villain having no bluffs in his range here. I too would say its hard to beat anything on this river.

link HH
Very nitty when we block the strs :P Might be one of your very best Bluff catchers here....

Would size up the turn - lots of spades are possible here. TXss KXss broadway straight draws with 2 spades - I think I would have bet really small and fold when he raises. He def. can have some QX here that might call a 30% bet, a T might get sticky vs a 30% bet. But yeah we cant expect to get tons of value here villain wont have a lot of dominates KX here anymore, since the main ones two paired up on this river obviously.