Alright, with my last two videos I did some tests. Before, with my 25 second intro, I saw about a 30% viewer drop when the intro started, regardless of if I placed it before or after my hook. On one video I cut the intro entirely and on the other I placed a smaller, ~5 second branding intro after the hook. On both videos I've only see about a 10% drop in viewers in the first 30 seconds and there isn't a clear point where they're clicking away. So, so far I haven't seen a difference between short intro and no intro but I've seen a huge difference in dropping the long intro. So for me at least, I'm just going to stick to the short branded intro.