I've myself started doing close to blueline rotation when I have the rwy. Shortfield, my old girl can easily lift off at around 50kts if pushed with two stages of flap, but that doesn't leave me any margin if one quits. Normal takeoff is around 70kts with one stage, but that's still below blue line. These days I keep her rolling a little longer and rotate around 80kts, which is close to blue line. This give me about a 15kts cushion to Vmc should anything happen at the very worst moment. That should be enough time to get things at least flying level as Pace mentioned.