But I just gave a bunch of examples of how he shows his anger. It’s been well-established that Vader chokes people when he’s angry. It’s like saying he isn’t angry when he chokes Padme and kills Dooku. It’s a cold-blooded thing he does out of anger. And being angry doesn’t always mean losing your composure.

How is this (slamming his lightsaber furiously) calm?
https://youtu.be/GueBXRYVhe0

Also you don’t get anymore blatant then “Much anger in him… like his father.” Who is established to be Darth Vader in that film itself.