That shield is there to reduce the amount of light emitted above the horizontal. By bending it back, you may have increased glare in foggy conditions, which defeats the intended purpose of the fog lights in the first place.
If you want fogs that throw a more noticeable beam, it's probably better to go with some aftermarket units.
If you want fogs that throw a more noticeable beam, it's probably better to go with some aftermarket units.