about a day ago I picked up the new yas skin, I played a few games and overall dominated my laner BUT I found that even when I was 7-1 I was still very killable by even the weakest teammates, I need help figuring out how to snowball effectively as Yas
I have your answer. Don't play yasuo.
have someone on your team rush rageblade kogmaw and you will be golden.
also if you're support isn't 
you aren't picking right
Here's the thing about Yasuo and every other assassin class. Minus itemization, masteries and runes, They're just as durable at level 6 and 7/0 as they are at level 6 and 0/7. You're banking almost entirely on the enemy dying before they can react. If they CAN react, they can shut you down just as easily as your atrophied counterpart. So the lesson to take away is don't allow yourself to become complacent and see the enemy team as minions with more gold just because you are ahead. It can just as quickly blow up in your face.
