There is something about the sound of your forge that doesn't sound right. Also, there was one point when the fire went out, and then re-ignited. And, it seemed to me to take too long to heat up your steel. The flame sounded better at the end when you experimented with moving the air control sleeve, and added more air. When my forge, which is about the same size as yours, is running right, the sound is steady, not pulsing. I hope that makes sense - ask if it doesn't. You definitely are on the right track, you just need to experiment with various was to tune it. And, get your steel hotter before you start hammering. Good luck.