You dont need buffs, you need queueing that works.
Its really really simple to do.
Allow no team to have a number advantage greater than 5 players over any other team. If people won't queue Dom 'because they suck' they will soon change their minds after queueing for 30 mins
Funny how it used to be that Nightfall were the side who sucked, had huge dis-advantages etc.... turns out it was just player mentality, what a strange world.