I have and have had a lot of MVP discs. In my experience color does not make a big difference in the flights of MVP discs. The issue with color is that it can influence how the plastic molds...Some colors might want to come out way domey and others flat, but MVP is on top of this and they take measures to make sure that all the discs are coming out as close to one another as possible. We know from the past that the pink FR Axis came out domey and were overstable, but many people flattened their pink Axis with hot water and it made them straight.
I think it's much more important to pay attention to domes/beads when comparing MVP discs than the colors. For example I have 5 176 Neutron Axis that are flat, 2 yellow and 3 red. I noticed that one of the reds has just a teeny bit higher shoulder than the other 4, enough so I can feel it in the hand. Out of those 5 Axis the other 4 all fly exactly the same, but the one higher shouldered disc is a bit more stable. So it was dome and not color that was making the difference.
Now to totally contradict myself...all my most overstable proton discs happen to be pink(both w/black and eclipse overmolds). They are all shaped overstable as well though (my pink Ion has a high overmold/huge bead, my pink Vectors are flat on the wing and pop up in the center).
