There is no way you can put that much weight on your head, far from the CG, and not expect some pain. Add up the weight of the helmet, the googles, and the counterweights, and you get much more mass than should be on your head. Get the rotor tracking a little out, thus some vibration going, and it can get bad. Unfortunately, I know of no good way to reduce the weight, nor the size, of the goggles. Just reducing the size, and thus the arm of the weight, would be a good start. If I could do that, I could become a rich man. But I can't, and I'm not, and won't be.