i think i bet like 15-20 on the river and fold to a CR. your thinking about the hand is pretty spot on IMO

I completely agree with Stoney here. You'd be surprised with what they would call a flop raise with. Most straight draws, any set, and probably top 2 as well. Shit, I get called by overpairs or even just top pair with overs sometimes. I almost never slowplay or just call with anything less than KKxx when I flop top boat. It's usually not necessary.

Also, on the river, you have to remember that villain potted the flop into the field. I have trouble seeing him doing that with a 56 in his hand on a JT4 flop? Of course, that's another reason to raise the flop.

I'm just about always happy to get it in with top set on the flop if it's the current nuts. Rarely, someone will be the favorite over you and even then you're never really crushed, but most the time your the favorite anyway. A lot of them in the Stars $50 game are calling off stacks with AAxx still. I just had it happen to me tonight.

The reason for the river bet is that 56 (or A5) is of course rare. But against someone who plays almost any 4 for a limp, it's definitely not unheard of, although not what he's betting the flop with.