So I think I have the solution to vayne and other hyper carries
Let's move BotRK's cost up to 3400. It should give people more breathing room against people like Vayne also drop the damage on recurve bow to 5.
This is mostly to delay people like Vayne and the abusers of sated. It will give at least another 30-45s of breathing room given perfect farming and hitting recurve will drop the effectiveness before Botrk giving even more room to fight back. I think what is so bad right now is that the build path got buffed. Before you would hit maybe 24% AS and the bildgewater, but now you hit 30% AS and add in an extra 10 damage. That means a lot early game. And if you hit recurve you also help push back Kalista's spike.
Honestly I think the problem with Vayne is she just ramps up much faster than she used thanks to build of botrk improving on top of the healing added to its damage.