With the Tannhauser, it's a guess, but is tackling it a conscious attempt on your part to push and develop technique?
One suggestion I would make is regarding the tricky passage from bar 39 onwards (and the recurrences of it). I can't see from the video, but I assume you're fingering it 12 12 12 in the lower rh notes? It's not easy to explain this sort of thing online, but I would practice it with that fingering with the 2 repeatedly coming over the 1 with a sort of dabbing motion. My experience is that you can play the passage cleanly with a fair amount of velocity that way (though having large hands surely helps).