The only way to struggle with a final flash is to charge it up about a third of the way and then release it. A fully charged kame will knock it back towards you, but it should even out before it reaches you. This is, of course, assuming you are nearly equal in power. A better bet is to just big bang it though... you might get lucky and smash his blast back into his face, or it might just slow it down long enough for you to move out of the way. It's a lot safer than connecting beams anyway.
Outside of melee I'd say I like the yellow attack a lot. I use it more than any of the signature attacks (when I'm playing as a saiyan) because it's easy to direct and it does a good amount of damage.