Tough one. Put it this way. If he's strong enough to call a big river bet, then he's strong enough to call a big turn reraise as well. I don't know about all in, but I would certainly bump it up to like $12-$15 after his re-raise.

I think what people forget is that slowplaying becomes more and more unneccesary with a powerful hand as the opponent becomes more confident. I think you wanted to be a little deceptive when calling the turn re-raise here, but at that point the cats out of the bag enough to start committing the opponent.