Put one of these devices together last year from your description and found my breathing interfered - took a while to learn how to benefit somewhat from the rig. (I don't have "six-pack" abs.)

Been wondering about extending the monopod and place the support socket much lower. Guess I need to start experimenting since the spring birding season is here. It is certainly a good idea, just need to refine mine.

Do enjoy using the forehead stabilizer, thanks.

I also use the mono placed between the seat and the driver's door for those out of the window shots. I can also then hop out of the car and use it as intended. I have a mono-gimbal head that adds to the flexibility.