All seems good except number 1 for the reasons you indicated
You rarely have a good hand when you get to the river in that spot and you would rarely CR because you wouldn't be expecting villain to bet alot because he checked behind turn. Ergo it is a very standard bluff catching spot in villains shoes.

2. Is good - I would do a filter where you check called flop with an unimproved pocket pair and folded to a turn bet in comparison to when you called the turn bet. I think you will find calling the double barrel is much more profitable than folding to it assuming you thought you were ahead of his range on flop.