Hi PM,
I've just caught up with your log but I might have missed something.
I am rather surprised by the popularity of Peppa the Pig. I saw a few episodes, when some of my siblings were little, and I found it absolutely brainmelting and horrible. There are better shows for children, even the small ones. Yes, you probably need something easier than a normal native series now, but that doesn't necessarily mean dropping the expectations this low!
You've done a lot of intensive listening with Buffy, how did it go? How about you either rewatched it, as you've been considering, or trying something similarly difficult? Something you have watched in English perhaps? I found series like Grimm, Once upon a Time, the Stargate (either SG1 or Atlantis), CSI anything, the Marvel shows, and others to be very accessible.
Extensive listening will be hard at first no matter what do you start with and when do you do it. The first episode or two will be very demanding and you won't be just relaxing and you won't understand everything. You won't understand all the details. You'll need to get to that point with practice. A good time and progress unit is one season, from my experience
And I think that crap like Peppa Pig is just a way to postpone the real progress at your level. Either you accept the challenge, or you're unlikely to ever get over this obstacle, just like those hundreds of thousands or millions intermediate English learners that never get rid of the subtitles entirely. And let's not forget that Pig is extremely far from the level expected from you in November, if you are still decided to sit the C1 exam. If you want to get there in time, I'm afraid you'll need to push yourself harder in this area. No offence meant, I am saying it as a friendly advice taking into account your own goals stated in this log.
If you want to watch intensively, which is definitely one of the good choices, then why should you delevel from Buffy to That Pig? And if you want to practice extensively, which I definitely recommend, then you'll need to just accept the process at some point. Just like my first singing teacher repeated to me over and over "Lâchez prise!" because I needed to hear it over and over.