Meh, I disagree with your theory about using less tags. You should use all 500 characters for optimal results. There is no proof that likes/dislikes does anything to the SEO. I’m sure that is more for the content makers info and viewers warning. The description can be up to 5000 characters. Best to post your other video links. You have no proof of anything, noone does, we can only guess how youtube seo works..

I was wondering if you are still following the replies here..and if you question: I used to be able to land a video on page one of GOOGLE for just about anything as long as the search count was typically under 500,000. It seems now, it is more difficult even to land on the first page for something like this..(and please go look at the examples and provide your input if you are still monitoring this page)

SIDENOTE. The endscreen needs to be baked into your video during the editing process. For our endscreen, both the subscribe circle and “next video” sections are blank. When you add end screen elements, it’ll fill those sections. The subscribe sphere should be 196 x 196 px and the video or playlist rectangle is 410px x 230px. Here’s a free template you can download.
This content will help you boost your rankings in two primary ways. First, more content means more keywords, and therefore more opportunities for Google to return your site in the search results. Second, the more content you have, the more links you generally accumulate. Plus, having lots of content is great for getting visitors to stay on your site longer. Win-win!