a nit? no... i think he checks back some of the time with an FD in a 3bet pot in position. i think bluffing the flop is best if you think he plays fit or fold.
As part of the overall decision-making club flushes are a pretty tiny part of the picture here imo both in terms of him having it and you repping it. I don't like your turn bluff since I think he so often has too much sdv to fold after checking back the flop. I think you are similarly hamstrung on the river. If I don't cb the flop (and I wouldn't want to), I'd give up completely on this particular board runout - it would be very different if a J,K or A fell or after bluffing the turn a spade rivered.
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