If you do have him beat and he has some sort of big pair w/ a spade type hand, he is probably good enough to know you aren't value betting worse there so his hand is pretty much a bluff catcher.

From the hand I really don't feel like he has you beat, and your range is so strong here if you bet the river that, that I don't think he is ever going to C/Shove as a bluff....

I'd just bet an amount that makes him think there are more bluffs in your range, I guess it's feasible that you could have 55/66 and just be trying to get him off a big pair.....

So I'd bet closer to pot, but a lot of it depends on more factors than you can give here. Some people will have a higher fold frequency to smaller bets because the opponent expects them to call....whereas some people have a higher fold to larger bets, simply because subconsciously they think "bigger bet, bigger hand."