Let me just state this as well for the time control thing. At the end of the day you play go because its fun and you intend to have fun. Improving is also fun. I enjoy slow games these days while in the past when I was a kid and learning I played blitz which I also enjoyed. I do not enjoy fast paced games as much as I use to.
But, in the defence of the slow paced games. I knew plenty of players who made 1dan in less then a year who played nothing but 30:00 to 45:00 games. So I think that you should do what makes you enjoy the game more.
Because I think in the long run no matter what methods you incorporate into your learning if you are not enjoying the game you won’t learn anything. If you are enjoying yourself then any method you implement to make it faster as long as you are enjoying yourself will be ultimately maximized.