i have ultimate pads also, mine seemed perfect until after about a week of use, they slow me down mega quick, they dont fad, but they squeak, and annoy the you know what out of me.
But mine only happens when im between 30-0km/hr so it starts squeaking around those slowing down speeds. Dont know why this is happening either, it could just be the pads themself, who knows.
Its only the front pads tho, same pads all around... They better not be worn out already, mind you from all the black dust that i spray away i wouldnt be surprised if i needed a new set already