I would say your biggest problem is edits, though I'm only saying this going off the sour drink video, it had way too many really slow parts that you could've just edited out or done something else with (like the sped up parts) realistically could've sped up the whole process by just saying *by the power of editing we'll be back after all this is poured out* or some s**t, and cut out a big chunk of the video.
See I was genuinely interested in the results and thought you were a crazy a** mofo, but the buildup killed the hype. Otherwise your personality was energetic enough to draw in a crowd, but yeah... video buildup needs work to keep people in and to keep them in for longer. Least for me anyways .