[Perk76]

I think a raise somewhere is needed, more than likely on the flop. But tread water after that since if he is a NIT as stated, he probably has a set at this point, so bloating the pot is not wise against a NIT.

If you raise the flop a true 11/7 player will not stick around if he doesnt have AK beat. But by calling him down, you give him a chance to think his AQ, AJ, A10, QQ, JJ might be good.

For the first time against a NIT I like OP's line and call him down to see what he is playing into the PFR with. He gets to showdown most of the time winning the maximum from a NIT and losing the minimum.

As played, raising the river is not a good idea.

Edited: Post flop aggression factor plays a huge roll in this also.