Your tires are cupped from one of two choices, The wheel alignment is off, or MUCH MORE likely from not running quite enough air pressure in them. Don't bother shaving them, Increase the press. 4psi per tire and live with the noise, ALL tires that cup WILL be noisy, If they are cupped both inside and outside them the alighnment is OK! I have Michelin PS-2's on mine with 14K on them and they make NO NOISE at all. | 
