Sajin1.093mv is the max safe for a 1080 ti, and that is also the max you can apply. It won't lock the voltage at idle as long as you press ctrl+l again to unlock the voltage.
SajinI've had that happen before. Try setting the core clock back to +0, and try again.
SajinPower, temp & voltage should all be maxed before doing it.
SajinYep, looks right.