I think I've figured out what the issue is. I'll talk about it here in case there are others who want to fix this (so to speak).
After reading all of your great replies, I decided to try priming myself a bit before recording videos today. I started with some meditation while listening to the brainwave entertainment that baccheion suggested, to help get into a flow state and get out of my head, then I did some bioenergetic type movements (look it up if you're interested) because I thought it may help raise my energy level, and I actually went over what I was going to talk about beforehand so that I could organize it in my head and also get it into my short term memory.
I was just looking back at the videos I filmed today and comparing them to ones I filmed a couple days ago and my speaking is much more fluent and less staccato. I still have umms and ahhs to work out, but other than that it is much better. I don't know how this could be applied to a social situation, but for my purposes it seems to work well.
My conclusion is that: A. I need to have something structured in my head already (i.e. have already talked about it before) before I can communicate it effectively.
And B. I am a naturally chill, low energy person, so in order to be a more effective speaker I need to raise my internal tempo to meet that of the rest of the world. When I was recording the videos today, I felt like I was speaking too fast, but after watching them back I realized that I was actually just speaking at a normal pace. Similarly, when I recorded videos before, I thought I was speaking at a normal pace, but when I watched them back I realized that my speech was a little slow and choppy.
Anyway, thanks for all the help everyone. I appreciate it!
