A few things:
1. Rotors rarely actually warp. The phenomena that generally is to blame is brake pad deposits on the rotor face. Doing some hard braking from ~55 to 5 mph 5 or 6 times in a row and then allowing the brakes to cool without having the brakes applied at all may help.
2. Vibration at or above a certain speed with everything else being the same often indicates a wheel (or wheels) that are out of balance.
3. I like the Z1 2-piece rotors on my car but for a non-competition or HPDE car they are probably just a waste of money.
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'11 370Z Nismo #528 Fast Intentions | Stillen | Motordyne | Uprev | CSF | Zspeed | Z1 Motorsports | AST | Swift | SPC | SPL | Whiteline | Hotchkis | Bride | Schroth | Robispec | Cusco | Nismo | Volk | Forgestar | Hoosier | RJM
'17 Titan Bone Stock
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