What sucks about this camera setup is that you will have to do one or more of these things to get a better angle.
1. Put a spacer near the center of the camera that angles the camera back more, but squishes your nose more. This is not ideal for riders with big heads or large noses.
2. Cut out some foam in the helmet where the camera would sit, and use spacers or whatever to get the proper angle. This is done by those with larger heads and cannot angle the camera back without modifying the helmet. This is not recommended because it can ruin the safeness and effectiveness of your helmet.
3. Mount your camera up further. This will change the angle some, but will block more of your view.
4. Tilt your head and/or helmet back more to get a better viewing angle. This would probably be uncomfortable.
5. Get a different helmet that has more space so you can modify the angle by adding spacers or whatever.
6. Get a horizontal compact camera without a protruding lens instead that you can sit on the inside of your helmet on the brim brim. This will give you the proper angle once you bring your shield down, and it's the camera setup that blocks the most view out of other camera setups, and it's also what many motovloggers do/have done. (M13, me, ashf00t, zmagic97, Woodenchairs, etc. etc.)