Riot, learn to balance Yi.
From what I observe, giving him more damage doesn't solve his main issue. With his current kit in place, all he can do is go back and forth between broken and trash. Maybe if you fixed his bugs (Alpha strike and feared during it but only runs away after the alpha hits) and etc he wouldn't be a problem anymore. You know...
The bugs you ignored for years?
Kinda like how you can hit someone at the last millisecond and not cancel their recall?
It either breaks him or 'breaks' him.