This will be short but powerful post with a professional tip I have learned to sing my lowest notes in the vocal booth. For the first time, I'm including a little impromptu video from my webcam to illustrate.
Simply put your hand on your sternum over your heart and gently press. It should cause your chest to open, not closed!) If you're doing it properly, you'll be getting taller, not shorter. Make sure your head stays back, don't let it bow forward.
You should find a resonant, rich, not hooty low note much easier to sing, and more controllable, too.
Did you try it? What did you notice?