I have another issue for you...
While trying to escape the black hole, the Enterprise is "warping" away, but staying relatively stationary, giving testament to the massive gravitational force of the black hole. When the warp cores are ejected, what keeps the Enterprise from suddenly flying back at the same speed as the cores? And how does the Enterprise then continue to "warp away" after the shockwave has thrown them clear of the gravity well?
As for the earlier issue of Nero knowing what Spock would be forced to see, he was brought back in time BECAUSE of the Red Matter, or at least some tech causing black holes.
Also, how is it that Delta Vega was not also drawn into the black hole, considering that the whole event was visible in the day sky.
As for the travel duration between Earth and Vulcan, I only see ONE possible location for a major gap in time, but even there, I doubt it very much. After Kirk is sedated, and then once Sulu says engines are at maximum is the ONLY location, because during that scene, Chekov says ETA is in 3 minutes, unless he is somehow talking for an hour, and we only hear some of it.