flattening the shield will put the focus farther down in the beam. you'll still have to aim it down, even farther, and now the focus will be closer than it should be to your car and make things more difficult to see when they're farthest away, which gives you the most reaction time. there's little to no benefit to just shaving off the shield unless you can then replace the material and make it step up in the other direction.
just aim them down a bit for now and use the time and energy you would use to flatten the beam to get LHD hid projectors. they're not that expensive, i'm sure you can wait until you get them.