As owner of a small audio studio, you speak from my soul.
Another easy way to check the audio quality of your room is to simply clap your hands once and to meausure time how long it takes for the sound to disappear.
Another easy way to greatly improve your audio is to use a pop-killer. The simpliest version is to use a nylon stocking clamped by a hanger and put that between your mouth and mic.
Great video, hope you make another one like this.