[sourbeaver]

With the flush draw out on the turn (you never know..) and the possibility that someone made a lower straight, I'd bet
closer to the pot (if they're both calling 20, they're calling 25-28). Then I'd raise more on the river, perhaps 55-60 because I think there's value to be extracted from these stations (ok, maybe we can't call an opponent holding a straight a "station", but still, it's gonna be hard for someone holding a 4 to put you on 4-7 exactly and proceed to let go of his hand once the pot gets that big and he went that far with it).