Ok, about the SSJ2 argument. When standing at the tournament vegeta first goes SSJ and blows up a bunch of people, which then angers goku and he transforms as well (SSJ).Neither of the mwent 2 yet. When they get teleported to the desolate place that can be found no where on earth... but it's right over there
, Goku goes SSJ2 and says something to the effect of "lets get this over with" Then Vegeta also goes SSJ2, which suprises the hell out of Goku, becuase he thought that only someone that has gone through as much as himself in the other dimension would be able to reach that high of a powerlevel. Then after goku saw Vegeta go SSJ2, he says " Wow, this is going to take longer than i thought." The electricity usually is only visible when they have ascended higher than a regular super saiyan, i haven't seen anyone in SSJ with electricity.
the Big bang looks fine, no need in changing color, and if it bothers you that much, then you can probably find a different one on Red saiyan.