I would hardly call that bad luck.

I am incredibly unlucky ive used 360 advanced vials on kakuzu, but still no usefull break for me, he may aswel still be 3 star.

but even taking my own experience out of the matter, 20 isnt a lot, I dont know of anyone on my group that has got a decent break skill with 20 vials, sorry to be a bearer of bad news, but in this game, 20 isnt bad luck. not the way oasis screw with us, frankly you'd have to be either blessed, barely active or a mod to get a break with that number