Your first mistake is cutting the rotor. Rotors rarely warp, the vibration you feel is from the deposits left on the rotors from the pads (too much heat or improper bedding). When you got your XP8, did you go through the bedding process that they told you to? You have to get the pads so hot that there is no pedal pressure left. Once you are done, everything should be ready to go as you really only have to bed the pad once.
Unless you are racing for money or time, buy the cheapest brand name rotor and get them cryo treated. Bed in the pads right and it should last you a while. I have gone through 4 sets of pads on my OEM rotor, no vibration or problems.
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